            ATR8000 Interface for the Atari 8 bit computers
            (and stand alone terminal, CPM, MSDOS use)


Since this manual was written in 1982, it does not include some newer 
technologies.  3.5" drives can be used with the system where 8" is
mentioned.  But only 720K.  1.44 or larger require additional hardware.
Note that even single sided, single density disks formatted on 
generic drives connected to the ATR will run faster on 810s and 1050s
due to the faster sector structure(interleave).  Also, the information
on direct connect floppy drives is for OLD mechanisms.  Newer drives
only need their number set.  Everything else is automatic.

It is now possible in some circumstances to have more than 4 drives as
described in this manual.  "1-4" can be replaced with "1-8" for drive
numbers using Atari drives with a hardware modification only.  Drive 9
can not be used, its reserved for the ramdisk when available.
OR, with certain software, any 9 drives can reside on an ST or a
PC hard drive.  But that is outside the scope of this document.

Modems are limited to 9600 baud without driver update at least. The 
hardware MAY also need updating.

Hard Drives can NOT be used without additional hardware and software.

Inkjet and laser printers can be connected just fine.

Page numbers are for reference only to the page number locations in 
brackets [] at the right margin.  This document is not set for proper
printing at page breaks(but you can do that if needed).

And obviously, warranties are no longer in effect.  Use at your own 
risk and liability.  Most of this info. also applies to the ATR8500.  Its 
main difference is the way it handles the serial port(so needs a different 
driver).

I have not included the CP/M information since you need the CP/M disk,
to make use of it.  I will make this section available if interested.
Same applies to what information I have on MSDOS mode using the CO-Power
board.  


RLD 20May2K
***************************************************************************


Software Publishers, Inc.  reserves the right to
make hardware, software and pricing changes
without notice.


Copyright c 1982
by Software Publishers, Inc. Arlington, Texas.



All rights are reserved. Reproduction or use of
this manual, without expressed permission in
writing,in any form,is prohibited.  This
manual may not, in whole or in part, be copied,
photocopied, reproduced, translated, reduced to
any electronic, chemical, or magnetic storage
system, or be translated into machine readable
form without prior consent, in writing, from
Software Publishers, Inc.(They are gone, so I
did it anyway).






Printed in the United States of America

ATARI 800, ATARI 400, ATARI 810 Disk Drive,
ATARI 820 Printer, ATARI 822 Printer, ATARI 825
Printer, ATARI 830 Modem, ATARI 850 Interface
Module, and ATARI DOS are all registered
trademarks of ATARI, Inc.

CP/M is a registered trademark of Digital
Research, Inc.

OS/A+ is a trademark of Optimized Systems, Inc.

Percom is a trademark of Percom Data Company.

Z-80 is a trademark of Zilog, Inc.



                                                                      [ 1]


Table Of Contents                                                   Page
 
Introduction .......................................................  7

     1.  The ATR8000 System ........................................  9

     2.  Power Requirements ........................................ 10

     3.  Protection from Radio Frequency Interference .............. 10

          A.  Radio Frequency Interference on ...................... 10
               Nonconnected Radio/TV

          B.  Radio Frequency Interference Within the .............. 10
               ATR8000 System

Connecting the Hardware ............................................ 12

     1.  Cable Specifications ...................................... 13

          A.  RS-232 Serial Printer Cable .......................... 13

          B.  Standard Centronics Parallel Cable ................... 14

          C.  Nonstandard Centronics Parallel Cable ...(removed)

          D.  Standard Drive Cable ................................. 15

     2.  ATR8000 Port Specifications ............................... 16

          A.  RS-232 Port .......................................... 16

          B.  FLOPPY DISK Port ..................................... 17

          C.  PRINTER Port ......................................... 18

     3.  Peripherals ............................................... 19

          A.  Disk Drives .......................................... 19

               1.  ATARI 810 Drives ................................ 19

               2.  Percom Drives ................................... 20

               3.  Using all 5 1/4"Drives .......................... 22

               4.  8" Drives ....................................... 22

                    A.  ATARI 810s, 5 1/4", and 8" Drives .......... 23

     B.  Modems .................................................... 24

          1.  ATARI 830 Modems ..................................... 24

          2.  The D.C. Hayes Smart Modem ........................... 24

     C.  Printers .................................................. 25

          1.  40 Column Printer: an ATARI 820 or 822 ............... 25

          2.  80 Column Printers if an ATARI 850 is not ............ 25
               Interfaced into the ATR8000 System (or 132
               Column Printers)

          3.  80 Column Printers if an 850 is Interfaced ........... 25
               into the System (or 132 Column Printers)

     4.  The Connection ............................................ 26

          A.  ATARI, ATR8000, 1+ Standard Drives, .................. 26
               Cables, 1 Adapter per 8" Drive

          B.  ATARI, ATR8000, 1+ Standard Drives, .................. 27
               1+ ATARI 810s, Cables, 1 Adapter per 8" Drive

          C.  ATARI, ATR8000, 1+ Standard Drives, 1+ ATARI ......... 28
               810s, Printer, Modem, Cables, 1 Adapter per
               8" Drive, ATARI 850

               1.  Without the 850 ................................. 29

               2.  With the 850 .................................... 30

               3.  Connecting a 40 Column Printer .................. 31

          D.  Other Connections .................................... 31

     5.  ATR8000 Jumper Options .................................... 33

          A.  16k or 64k ........................................... 33

          B.  ATARI or RS-232 Terminal ............................. 33

          C.  2k or 4k Operating ROM ............................... 34

          D.  RS-232 Configuring ................................... 35

          E.  Undefined .............................................37

     6.  Internal Drive Configuring .................................38

          A.  5 1/4" Drives ........................................ 38

               1.  Radio Shack Drives .............................. 41

               2.  ATARI 810 Drives ................................ 41

               3.  Percom Drives ................................... 41

          B.  8" Drives ............................................ 42

     7.  Connecting an RS-232 Terminal to the ATR8000 .............. 43


III. SOFTWARE ...................................................... 44

     1.  ATARI DOS ................................................. 44

          A.  Copying ATARI DOS to an 8" Disk ...................... 44

          B.  Modems ............................................... 45

          C.  Printers ............................................. 46

               1.  PRINTOFF.BAS .................................... 44

               2.  PRINTON.BAS ..................................... 48

     2.  OSA+, VERSION 4 ........................................... 49

IV. Testing the Installed System ................................... 50

V.  Expanding the ATR8000 .......................................... 51



                                                                      [ 5]


 Diagrams                                                           Page

 1.  Cable Binding for Monitor ..................................... 11

 2.  RS-232 Printer Cable .......................................... 13

 3.  Standard Centronics Parallel Printer Cable .................... 14

 4.  Nonstandard Centronics Parallel Printer Cable ................. 14

 5.  Standard Drive Cable........................................... 15

 6.  RS-232 Port Pin Order ......................................... 16

 7.  FLOPPY DISK Port Pin Order .................................... 17

 8.  PRINTER Port Pin Order ........................................ 18

 9.  The Percom ATARI Controller Drive ............................. 21

10.  Hardware Connection Diagrams

     A.  The Ports of the ATR8000 (BackView) ....................... 26

     B.  Making the Connections (for II.4.A.) ...................... 27

     C.  Making the Connections (for II.4.B.) ...................... 28

     D.  Making the Connections (for II.4.C1.) ..................... 29

     E.  Making the Connections (for II.4.C2.) ..................... 30

     F.  Making the Connections (for II.4.C3.) ..................... 31

11.  Jumper Option Locations ....................................... 32

12.  16k or 64k --J1, J2, J3, J4, J5, J6, J8 ....................... 33

13.  ATARI or RS-232 Terminal -- J7, J10 ........................... 34

14.  2 or 4k Operating ROM -- J9 ................................... 35

15.  RS-232 Configuring -- J12 ..................................... 35

     A.  To Connect an Epson Serial Printer (the default) .......... 36

     B.  To Connect an RS-232 Terminal to the RS-232 Port .......... 36
          to Communicate with the ATARI

     C.  To Connect a D.C.  Hayes Smart Modem ...................... 37

16.  Undefined --  J11 ............................................. 37

17.  Locations for Internal Drive Configuring ...................... 38

18.  Jumper Options for 5 1/4" Drives .............................. 39

19.  Drive Numbering #1 ............................................ 40

20.  Drive Numbering #2 ............................................ 40



                                                                      [ 7]

 I.  Introduction


Congratulations, you have purchased the most expandable,
versatile disk interface available for your ATARI800/400.  The
ATR8000 allows you to delve beyond the ATARI microcomputer world
into another that offers nearly countless hardware and software
options.

Serial or parallel printers can be connected to the ports of the
ATR8000.  You 'can choose from medium-speed, economical dot matrix
printers to the faster, slightly higher priced, dot addressable
dot matrix printers,  OR you can get the quality and printing
versatility of a more expensive daisy wheel printer.

For program storage, single, double or quad density, single or
double-sided, 5 1/4" or 8" disk drives can be connected to the
ATR8000.  You're not limited to one type or size of drive, because
you can intermix them!

Single density ATARI DOS and double density OSA+, Version 4, can
both be run on the standard ATR8000.  OSA+, Version 4, is a
double density DOS that runs twice as fast as ATARI DOS and
stores twice as much data on a disk.  The 64k upgrade includes
CP/M configured for the ATR8000, complete with the standard CP/M
manual.  Software Publishers, Inc.  furnishes additional double
density software for CP/M purchasers.

CP/M purchasers receive DDINIT.COM: a double density disk
initializing program with several double density format options;
DDSYSGEN.COM: a sysgen program for reading and writing double
density system tracks; CONFIGUR.COM: for selecting the proper
printer driver to be incorporated into the double density systems
tracks; DDCOPY.COM: a double density copy program; DISKDEF.COM: a
utility program for defining CP/M parameters for compatibility
purposes; MODEM7.COM: a reconfigured CP/M users' group program
that runs the D.C.  Hayes Smart Modem on the RS-232 serial port;
and DISKMON.COM: a program for primitive disk access.

To connect the ATR8000, the ATARI 800/400, disk drives and any
peripherals you have, choose the hardware connection subsection
in Section II that best matches your equipment.  Thoroughly read
the configuring instructions for drives, printers and jumper
options before testing the system.

Detailed information on the construction of the cables used with
the ATR8000 system is in Section II.l.  This subsection has been
included so you know exactly how the cables are made and is for
helping you if you prefer to make your own cables.  Some
peripherals, like those connected to the RS-232 Port, require
configuring of jumper options on the ATR8000 circuit board.  These
options are clearly outlined in Section II.5.

Then, when all hardware components are connected and configured,
test your system by following the guidelines in Section IV.

INTRODUCTION

Section II also details how to connect a RS-232 terminal to the
64k ATR8000.  Section V explains how to connect and test
components added to the ATR8000 in the future.

The last section, Section VII, contains warranty information and
the software license.  Complete the enclosed warranty card and
return it to us within 10 days to ensure that your ATR8000 is
under warranty.

Thoroughly read this manual and carefully follow the instructions
contained within to connect the ATR8000 and to start your journey
into a broader-based microcomputer world.  Because the ATR8000 is
immensely versatile, the peripherals that can be connected are
nearly countless.  This means you need to thoroughly read this
manual to obtain a complete knowledge for configuring and
connecting your system.

We suggest reading the entire manual before attempting any
connections.  Then, when you understand all the stipulations
involved, this familiarity will make connecting and configuring
the system less confusing.



                                                                      [ 9]

I.1. The ATR8000 System:


ATR8000 - the basic unit.  It is a 4MHz Z80 double density
processor that comes with 16k RAM.  This RAM is upgradeable to 64k.
The ATR8000 has a COMPUTER IN port for connecting the ATARI
800/400, a PERIPHERAL OUT port for connecting the ATARI Daisy
Chain Cable, a parallel PRINTER port, a FLOPPY DISK serial port
for connecting disk drives, and a RS-232 port.  A cable for
connecting the ATR8000 to the ATARI 800/400 is included.


                         THE BACK OF THE ATR8000
-------------------------------------------------------------------------
|                                                                       |
|                                              PERIPHERAL OUT  COMPUTER |
|   RS-232    FLOPPY DISK     PRINTER           -----------  ---------- |
|  --------     ----------   ----------         -----------  ---------- |
|  |      |     |        |   |        |           POWER CORD       *    |
|  --------     ----------   ----------              |-----|     RESET  |
-------------------------------------------------------------------------

64k UPGRADE increases the ATR8000 RAM to 64k.  CP/M configured
for the ATR8000 is included, along with a separate CP/M manual.
Software Publishers, Inc.  supplies several double density
systems programs for CP/M users.  These include DDINIT.COM,
DDSYSGEN-COM, DDCOPY.COM, CONFIGUR.COM, DISKDEF.COM, MODEM7.COM
and DISKMON.COM (all are explained in the Introduction and in
Section III).  CP/M is available on both 5 1/4" and 8" disks.


OSA+,VERSION 4 - a double density ATARI DOS.  This is
approximately twice as fast as single density ATARI DOS and
stores twice as much data on a disk.  A separate manual detailing
the use of this DOS is included.  This DOS is available on both 5
1/4" and 8" disks.


5 1/4" DISK DRIVES - high-quality drives that have their own
power supplies and enclosures.


PRINTER CABLES - we manufacture both serial and parallel printer
cables to connect a printer to the ATR8000.


STANDARD DRIVE CABLES - daisy chain drive cables that plug into
the FLOPPY DISK port in the back of the ATR8000.  Available in
both 2-connector and 4-connector styles.


8" ADAPTERS - used to connect an 8" drive to the Standard Drive

Cable.  These special adapters allow you to connect both 5 1/4"
and 8" drives on the same cable, letting you run both drives
sizes at the same time.


                                                                      [10]


I.2. Power Requirements


The ATR8000 and all Software Publishers, Inc.  peripherals
requiring power plug into regular wall sockets (115-120 volts
AC).  The ATR8000 has a built-in MOV (Metal Oxide Varistor) to
suppress power surges and keep voltage at a safe level to protect
sensitive circuit components.


I.3.  Protection from Radio Frequency Interference

I.3.A.  Radio Frequency Interference on Nonconnected Radio-TV

The ATR8000 uses and generates radio frequency energy.  For this
reason it has built-in RFI (Radio Frequency Interference)
suppression to filter radio frequency noise.  It is possible that
the unit could cause interfere-nee to radio or television
reception while it is operating.  If you think the operating
ATR8000 is causing interference, turn the unit off and check to
see if the supposed interference still exists.

If interference is being caused by the unit, try one or more of
the following:

- reorient the receiving antenna on the radio or television
having reception difficulties.

- relocate the computer or radio-television.

- if the computer and the radio-television are plugged into
the same power circuit, plug the computer into a different
power outlet than the radio-television.

If you still have difficulties, you can write to the Federal
Communications Commission for their pamphlet, "How to Identify
and Resolve Radio-TV Interference Problems."  This is available
from the United States Government Printing Office, Washington, DC
20402, Stock No.  004-000-0035-4.


I.3.B.  Radio Frequency Interference Within the ATR8000 System


Proper lacing of the connection cables will eliminate radio
frequency problems within the ATR8000 system.  If, during system
operation interference occurs on the television used for a
monitor, reposition the system's components (i.e., ATARI,
ATR8000, drives, etc.).  To properly lace cables:

1) Keep all I/O cables away from ATR8000 power cable.

2) Excess wire between the ATARI and the television adapter
must be looped properly.  Do not circularly coil the
cable as this will cause it to act as an antenna! Bind
the excess cable as close to the top of the television
set as possible.  For the proper method of zigzagging the
cable, see the diagram below.  Then, tie the middle of the
bundle together as shown.


DIAGRAM 1: Cable Binding for Television

                   TIE HERE --*
           -------------------*---------------------<  To Atari
           |                  *
           -------------------*---------------------
                              *                    |
           -------------------*---------------------
           |                  *
           -------------------*---------------------
                              *                    |
           -------------------*---------------------
           |                  *
           -------------------*---------------------
                              *                    |
    TO TV <-------------------*---------------------
                              *




                                                                      [12]

II.  Connecting the Hardware

To successfully and properly connect the components of the
ATR8000 system, carefully read the following subsections.  Each
subsection details vital connection information.  If at first you
do not thoroughly understand any of the hardware information, go
over the information until you have a working knowledge of the
connection stipulations.  (For unresolvable difficulties, consult
your dealer).

It is important to unplug and turn off the power on all of the
components before connecting and configuring the ATR8000.  If a
component is turned off but is still plugged into an electrical
socket, you can be electrically shocked.

For any connection it is important that the cables are correctly
interfaced to the ATR8000.  Subsection 1 contains diagrams showing
the construction of each type of cable that connects to the
ATR8000.  Pin 1 on each cable is marked.  (On some types of cables,
Pin 1 is denoted by a colored wire on an outside edge of the
cable.)

Subsection 2 contains ATR8000 port information.  The order of each
port's pins is shown along with a listing of the pin signals.  Pin
1 of the port must be connected to Pin 1 of the interfacing
cable.

Specific information about disk drives, modems and printers is
discussed in Subsection 3.  This information MUST be considered
before making any connections.  Once the first three subsections
have been carefully read, the actual connections of the cables
are done in Subsection 4.  Subsection 4 is divided into several
subdivisions that describe interconnecting different amounts and
types of peripherals.

After the cables have been connected,the ATR8000's jumper
options need to be considered.  These options and their settings
are described in Subsection 5.

The next step is internally configuring all of the system's
drives to have unique and valid drive numbers.  Subsection 6
details this process for various types of drives.

Subsection 7 explains the optional connection of an RS-232 serial
terminal to the 64k ATR8000 (in place of the ATARI).  The 64k
ATR8000 and an RS-232 terminal can be used for CP/M operation.

After completing this Section, go on to Section III.  Software.
Then Section 4 will tell how to test the installed ATR8000
system.



                                                                      [13]


II.1.  Cable Specifications


This section contains diagrams that detail the construction of
the cables used with the ATR8000 system.  If you make your own
cables, or purchase cables from a source other than Software
Publishers, make sure they are constructed this way.


II.1.A.  & DIAGRAM 2: RS-232 Serial Printer & Modem Cable

ATR8000                                             Serial Printer/Modem
   |==|------------------------------------------------|==|
   |  |             25 conductor cable                 |  |
   |  |                                                |  |
   ----                                                ----

        /Pin 1                        Red Conductor     /O\
   |==|------------------------------------------------|==|-Pin 1
   |  |-----                                         --|  |
   |  |----                                         ---|  |
   |  |-                                            -- |  |
   |  |--                                             -|  |
   |  | ----                                        ---|  |
   |  |---                                           --|  |
   |==|------------------------------------------------|==|
    26 pin card connector                               \O/
                                                      25 Pin DB connector


                                                                      [14]


II.l.B.  & DIAGRAM 3: Standard Centronics Parallel Printer Cable

ATR8000
   ----
   |  |
   |  |                                         Parallel Printer
   |==|------------------------------------------------|==|
                    36 conductor cable                 |  |
                                                       |  |
                                                       ----

  /Pin 1                             Red Conductor     /\/\
  \|==|------------------------------------------------|==|-Pin 1
   |  |-----                                         --|  |
   |  |----                                         ---|  |
   |  |-                                            -- |  |
   |  |--                                             -|  |
   |  | ----                                        ---|  |
   |  |---                                           --|  |
   |==|------------------------------------------------|==|
    34 pin card connector                              \/\/
                                                      36 Pin Centronics
                                                        connector



(Diagram 4 omitted)
                                                                      [15]


II.1.C.  & DIAGRAM 5: Drive cable

ATR8000
   ----
   |  |
   |  |                         Drives
   |==|----------|==|--------|==|--------|==|--------|==|
                 |  |        |  |        |  |        |  |
                 |  |        |  |        |  |        |  |
                 ----        ----        ----        ----

                                     |Red Conductor
                                     | 
                 /Pin 1     /Pin 1   |  /Pin 1      /Pin 1
       /Pin 1    \          \        v  \           \
   |==|----------|==|--------|==|--------|==|--------|==|
   |  |-----   --|  |----  --|  |---   --|  |---   --|  |
   |  |-----   --|  |---   --|  |---   --|  |----  --|  |
   |  |-      -- |  |---   --|  |---   --|  |---   --|  |
   |  |--       -|  |----  --|  |----  --|  |----- --|  |
   |  | ----  ---|  |---   --|  |---  - -|  |----  --|  |
   |  |---     --|  |----  --|  |----  --|  |---   --|  |
   |==|----------|==|--------|==|--------|==|--------|==|
    34 pin card connector(5)    34 conductor cable


                                                                      [16]


II.2 ATR8000 Port Specifications


This subsection lists the pin information for each of the
ATR8000's ports.  Supplementary diagrams show the order of the pin
numbers on each port's edge connector.


II.2.A.  RS-232 Port


RS-232 Port Pin Information

 1.  N.C.  (not connected)          14.  N.C.
 2.  Transmit Data                  15.  N.C.
 3.  Receive Data                   16.  N.C.
 4.  Request to Send                17.  N.C.
 5.  Clear to Send                  18.  N.C.
 6.  Data Set Ready                 19.  N.C.
 7.  Signal Ground                  20.  DTR
 8.  Carrier Detect                 21.  N.C.
 9.  N.C.                           22.  Ring Indicator
10.  N.C.                           23.  N.C.
11.  Reverse Channel                24.  N.C.
12.  N.C.                           25.  N.C.
13.  N.C.                           26.  N.C.


When looking at the back of the ATR8000 the RS-232 Port pins are in
the order shown below.  When interfacing to this port, make sure
that Pin 1 on the RS-232 cable is connected to Pin 1 of the port.


 DIAGRAM 6: RS-232 Port Pin Order

 14  15  16  17  18  19  20  21  22  23  24  25  26

--+---+---+---+---+---+---+---+---+---+---+---+---+--

  1   2   3   4   5   6   7   8   9  10  11  12  13



                                                                      [17]

II.2.  B.  FLOPPY DISK Port


FLOPPY DISK Port Pin Information

 1. Ground                            18. Direction Select
 2. N.C. (3.5" 1.44meg det)           19. gnd 
 3. gnd                               20. Step
 4. N.C. (poss.  3.5" 2.88meg det)    21. gnd
 5. gnd                               22. Write Data
 6. Drive Sel 4                       23. gnd
 7. gnd                               24. Write Gate
 8. Index                             25. gnd
 9. gnd                               26. Track 00
10. Drive Sel 1                       27. gnd 
11. gnd                               28. Write Protect
12. Drive Sel 2                       29. gnd
13. gnd                               30. Read Data
14. Drive Sel 3                       31. gnd 
15. gnd                               32. Side Sel
16. Motor On                          33. gnd 
17. gnd                               34. N.C.


When looking at the back of the ATR8000, the FLOPPY DISK Port pin
numbers are as shown below.  When connecting a disk drive cable to
the port, make sure that Pin 1 on the cable matches Pin 1 on the
port.


DIAGRAM 7: FLOPPY DISK Port Pin Order

 33  31  29  27  25  23  21  19  17  15  13  11   9   7   5   3   1

--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+--

 34  32  30  28  26  24  22  20  18  16  14  12  10   8   6   4   2




                                                                      [18]


II.2.C.  PRINTER Port

PRINTER Port Pin Information

 1.  Strobe                           18. gnd 
 2. (Ground)                          19. D3 In (*ack)
 3. DO Out (Data 0)                   20. gnd 
 4. gnd                               21. D7 In(busy)
 5. D1 Out                            22. gnd 
 6. gnd                               23. D6 In(paper out)
 7. D2 Out                            24. gnd
 8. gnd                               25. D5 In(selected)
 9. D3 Out                            26. N.C.(*prime)
10. gnd                               27. gnd 
11. D4 Out                            28. D4 In (*error)
12. gnd                               29. D2 In
l3. D5 Out                            30. D1 In
14. gnd                               31. N.C.
15. D6 Out                            32. DO In
16. gnd                               33. N.C.
17. D7 Out                            34. N.C.


When looking at the back of the ATR8000 at the PRINTER Port, the
pins are numbered as below.  Make sure that you match Pin 1 on the
Port with Pin 1 on the cable used to interface into the PRINTER
Port.  (This is a parallel port.)

DIAGRAM 8: PRINTER PORT Pin Order

 33  31  29  27  25  23  21  19  17  15  13  11   9   7   5   3   1

--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+--

 34  32  30  28  26  24  22  20  18  16  14  12  10   8   6   4   2



                                                                      [19]


II.3.Peripherals

The ATR8000 system is extremely versatile; it interfaces with
nearly.  any peripheral on the microcomputer market.  This means you
can connect various types of disk drives, printers and modems to
the system.  Due to this versatility, connecting peripherals can
be complex (depending on what you have acquired).

This subsection explains necessary information for connecting
some types of peripherals, including the affect of certain
peripherals on other components in the system.  Carefully read
this data.  If your equipment requires that several considerations
be met to connect the hardware, we suggest making notes to refer
to while actually doing the connection (following Section II.4.).

II.3.A.  Disk Drives

The ATR8000 accepts all standard 5 1/4" and 8" disk drives.  ATARI
810 and Percom drives can also be used with certain limitations.
Disk drive sizes (5 1/4" or 8"), densities (single, double or
quad) and type (single or double-sided) can be intermixed.  All
drives must have their own power supplies.

Before connecting drives to the system, familiarize yourself with
the following disk drive information.

II.3.A1.  ATARI 810 Drives

ATARI 810 disk drives are nonstandard drives that are only
capable of single density operation.  These drives can be used
with the ATR8000 to run single density ATARI DOS.  They can also
be used for additional storage (single density) while the system
is operating under OSA+, Version 4.  (To run OSA+ the system must
have at least one standard drive.) They cannot be used when
running CP/M.

ATARI 810 drives are connected to the ATR8000 on the ATARI Daisy
Chain Cable that is connected to the PERIPHERAL OUT Port of the
ATR8000.  The ATR8000 will run up to four drives of mixed
definition.  So if one ATARI 810 is connected, three standard
drives can also be connected.

The drive designated to be Drive 1 is the drive that boots the
operating system.  A standard 5 1/4" drive can boot all three
DOSes (ATARI, OSA+, and CP/M), whereas an ATARI 810 can only run
single density and, therefore, can only boot ATARI DOS.  You could
reconfigure the system and change the numbering of the drives to
boot different DOSes (having an 810 be Drive 1 for ATARI DOS, and
because of this, if you are going to operate under OSA+ or CP/M
(and, therefore, have at least one standard disk drive), we
suggest that any 810 drives be designated as the highest drive
numbers to avoid drive renumbering.  (Changing the numbers of the
drives requires that you reconfigure them internally.  See Section
II.6)
 

If you have ATARI 810 drives and 8" drives, being able to boot
all three DOSes from the same drive becomes more complex.  For
the stipulations involved, refer to Section II.3.  A4.

                                                                      [20]


II.3.A2.  Percom Drives


ATARI Controller Drives:

A Percom ATARI controller drive can be used with the ATR8000 with
some limitations.  To operate ATARI DOS or OSA+, it can be
connected (with no alterations) to the ATARI Daisy Chain Cable
that connects to the PERIPHERAL OUT Port of the ATR8000, or it
can be used as standard disk drive if the Percom ATARI controller
board is disconnected and the drivers controller board is
connected to the Standard Drive Cable (which connects to the
FLOPPY DISK Port of the ATR8000).  To run CP/M, the Percom ATARI
controller board must be disconnected.

Use a screwdriver to take the screws out of the Percom drive
enclosure and take the cover off.  The Percom ATARI controller
drive is shown in the diagram on the opposite page.

Notice that when looking at the front of the drive (where the RFD
light is to the right side of the drive), the drivers controller
board is on the left side of the drive (it is roughly 511 by 511)
and the Percom ATARI controller board is on the right side of the
drive (it is a larger card, roughly 5" by 8").

An internal cable connects the Percom controller board to the
drivers controller board, then this cable connects from the
drivers controller board to the connector on the back of the
drive enclosure.  To use the Percom ATARI controller drive as a
standard drive, first disconnect the cable from the drivers
controller board.

Now bring a connector on a Standard Drive Cable into the drive
enclosure, and connect it to the edge connector on the drivers
controller board (matching Pin 1s).  Then thread the cable out the
back of the drive.  For now, leave the cover off, as later you
will learn how to internally configure the drive for drive
number.



Percom ATARI Add-on Drives:

Percom ATARI add-on drives are standard disk drives.  They have an
internal cable that connects the edge connector of the drivers
controller board to the pin connector on the outer edge of the
drive.  Remove the drivers cover and disconnect this cable and
plug the Standard Drive Cable onto the edge connector of the
drivers controller board.  Leave the drivers cover off until the
drive is configured for drive number, late@ in this section.

                                                                      [22]


II.3.A3.  Using all 5 1/4" Drives


Connecting standard 5 1/4" drives with or without ATARI 810
drives is fairly straightforward.  An ATARI 810 drive can only
boot single density ATARI DOS, whereas a standard 5 1/4" drive
can boot ATARI DOS, OSA+ and CP/M.  Therefore, when assigning
drive numbers for a system that consists of a mixture of these
two types of drives, it is best to set the standard drives as the
lower drive numbers and ATARI drives as the higher drive numbers.
(Remember that the system is booted from Drive 1.)

Due to different interfaces, ATARI 810 drives and standard drives
are connected on different cables.  ATARI 810 drives are
interfaced to the ATARI Daisy Chain Cable which is connected to
the PERIPHERAL OUT Port of the ATR8000.  Standard drives are
connected to the Standard Drive Cable which is connected to the
FLOPPY DISK Port of the ATR8000.

You must be careful to have unique drive numbers assigned to the
drives. For example, if standard drives are designated as Drive 1
and Drive 2, an 810 drive must be either Drive 3 or Drive 4.
(On the Standard Drive Cable there must be a drive connected on
the connector that is furthest from the ATR8000 port connector.
This drive can be configured to be any drive number.) After you
decide on drive numbers and follow the correct hardware
connection section, Subsection 6 tells how to internally set the
drive for drive number.


II.3.A4.  8" Drives

ATARI 810s and 8" Drives:

ATARI 810 drives are connected to the PERIPHERAL OUT Port of the
ATR8000 on the ATARI Daisy Chain Cable.  Standard 8" drives are
connected to the FLOPPY DISK Port of the ATR8000 using the
Standard Drive Cable and one 8" adapter board for each 8" drive.
Mixing ATARI 810 drives and standard 8" drives requires some
preconnecting decisions.  An ATARI 810 will not boot OSA+ or CP/M
and a standard 8" drive cannot boot a 5 1/4" ATARI DOS disk.
There are two options:

1) An ATARI 810 can be set as Drive 1 to boot ATARI DOS, with
the 8" drives set as higher drive numbers.  To boot OSA+ or
CP/M the drives would have to be renumbered so that an 8"
drive is Drive 1.  This means to switch between these DOSes,
you have to reset the configuration of the drives.  (Drives
are set for drive number internally.  See Section II.6.  for
details.).

2)Initially an ATARI 810 can be set as Drive 1 and an 8" drive
set as Drive 2.  Then ATARI DOS can be copied to an 8" disk
(instructions are in Section III.  Software).  LIMITATION: This
does limit the use of the 8" drive the DOS is run from.  ATARI
DOS formats by sectors.  An 8" disk has 2002 sectors (single
density), whereas a 5 1/4" disk has 720.  ATARI DOS running on
an 8" disk will only use the first 720 sectors of the 2002
available on the 8" disk.

Although ATARI DOS on an 8" disk doesn't give full access to
the disk, it does save you from having to renumber the drives
when switching DOSes.  After the ATARI DOS is transferred to
an 8" disk, renumber (and internally configure the drives)
so that Drive 1 is an 8" drive.

To connect an 8" drive to the Standard Drive Cable, plug the 50-
pin connector on the 8" drive adapter board into the edge card
connector on the drive, with the adapter board's connector on the
upper side of the adapter circuit board.  Then plug a connector on
the Standard Drive Cable into the 34-pin edge connector of the
adapter board.

                                                                      [23]


II.3.A4A.  ATARI 810s, 5 1/4", and 8" Drives


Before reading on, read the above information on ATARI 810 drives
and standard 8" drives.  The considerations for connecting all
three of types of drives becomes complex, so after reading the
above subsection, carefully read the following information.

To eliminate unnecessary drive renumbering, we suggest that all
operating systems be on the same disk size (5 1/4" or 8").  This
enables the same drive to boot all three DOSes.

If you have all three types of drives, a standard 5 1/4" drive is
the best drive for running all three operating systems because it
can boot both single and double density and it utilizes all
available disk space on the disk in Drive 1.  For users that only
run OSA+ and CP/M, an 8" drive is equally qualified to run both
DOSes as each is available on an 8" disk and both DOSes will use
all available disk space.

ATARI DOS can be transferred to an 8" disk (with limitations
explained in Section II.3.  A4.  and in the Software Section).  So an
8" drive could be Drive 1 for all DOSes.

If your DOSes are on different disk sizes, the drives will have
to be renumbered to boot the different systems.  Drive 1 must be
used to boot.  It is better to have the same drive boot all DOSes.


                                                                      [24]


II.3.B.  Modems

Standard modems can be connected to the RS-232 Port of the
ATR8000.  Custom Modem Software for using a standard modem for
ATARI DOS, OSA+ and CP/M will be available soon.  To use a modem
with the ATR8000 (or to connect any peripheral to the RS-232
Port), you must configure J12 on the circuit board of the
ATR8000.  This jumper option is explained in detail in Section
II.5.D.  RS-232 Configuring.


II.3.B1.  ATARI 830 Modems


The ATARI 830 modem can be used in two ways.  It can be connected
to the RS-232 Port of the ATR8000 and run using our Custom Modem
Software, or it can be interfaced through the ATARI 850 Interface
Module.  If it is connected to the 850, the 850 is connected
between the ATARI and the COMPUTER IN Port of the ATR8000.

Using an 830 Modem through the 850 affects the printing operation
of the ATR8000.  The ATARI 850 Interface Module and the ATR8000
both respond to printer signals.  As long as the 850 is interfaced
to the ATR8000 system, the printer must be connected to the 850
and a special program (PRINTOFF.BAS) must be run to disable the
ATR8000's printer signals.

The ATARI 830 Modem cannot be used under CP/M if it is connected
to the 850 (no peripheral can), neither can a printer be used for
CP/M operation if it is connected to the 850.  These are the
stipulations:

1)To use an 830 Modem with the 850 interface, it can operate
for ATARI DOS or OSA+.  The modem cannot be used for CP/M
until it is disconnected from the 850 and directly connected
to the ATR8000.

2)When using the 830 Modem and the 850, the printer must be
connected to the 850 and the printer function of the ATR8000
must be disabled using PRINTOFF.BAS (PRINTOFF.BAS is listed
in Section III.1.B1).  Only 80 column printers will function
--the ATARI 820/822 printers will not interface with the
850.  The printer will not print under CP/M until the printer
is directly connected to the ATR8000 and the 850 is
disconnected from the system.


II.3.B2.  The D.C.  Hayes Smart Modem

Purchasers of the Software Publishers's ATR8000 64k upgrade
receive MODEM7.COM, a program for operating the D.C.  Hayes Smart
Modem from the RS-232 Port of the ATR8000.  This program from the
CP/M user's group, has been rewritten specifically for the
ATR8000.  It is only for CP/M modem operation.

To run this modem, Jumper Option 12 on the ATR8000 circuit board
must be properly configured.  Instructions for doing this are in
Section II.5.D.
 
                                                                     [25]


II.3.C. Printers

The ATR8000's PRINTER Port is a parallel port.  Serial printers
are connected to the RS-232 Port (J12 must be configured for any
peripheral connected to the RS-232 Port).  Certain printers can
also be connected to the ATARI Daisy Chain Cable or to the ATARI
850 Interface Module.

II.3.C1.  A 40 Column Printer: an ATARI 820 or 822

ATARI 820/822 printers can be used for printing under ATARI DOS
or OSA+ when connected to the ATARI Daisy Chain Cable.  Before
printing, the printer function of the ATR8000 must be disabled by
running PRINTOFF.BAS (listed in Section III.l.  Bl).

ATARI 820/822 printers cannot be connected if an ATARI 850
Interface Module is connected to the system.  A 40 column printer
cannot be used for CP/M printing.

II.3.C2.  80 Column Printers if an ATARI 850 is not Interfaced
into the System (or 132 Column Printers)

A parallel 80 column (or 132 column) printer is connected to the
PRINTER Port of the ATR8000.  A serial 80 column (or 132 column)
printer is connected to the RS-232 Port of the ATR8000 (and J12
is configured).  Normal print commands for ATARI DOS, OSA+ and
CP/M all function.

II.3.C3.  80 Column Printers if an ATARI 850 is Interfaced into
the System (or 132 Column Printers)

If an ATARI 850 Interface Module is connected to the ATR8000
system, the printer must be connected to the 850 to print under
ATARI DOS or OSA+ and PRINTOFF.BAS must be run to disable the
ATR8000's printer function (PRINTOFF.BAS is listed in Section
III.1.  B1).  The 850 must be disconnected to print under CP/M and
the printer must be connected directly to the ATR8000.


                                                                      [26]


II.4.  The Connection

Before connecting the ATR8000, the ATARI and your other
components together, you should have already read Subsections 1 -
3.  If you have not done so, do that before continuing.

You now know the stipulations involved for connecting your
equipment.  It may be helpful to refer to the above subsections
during the connection procedure.  When you have made all the
connections, DO NOT REPOWER THE SYSTEM UNTIL YOU HAVE READ AND
COMPLETED ALL SUBSECTIONS IN THIS HARDWARE CONNECTION SECTION.

Before attempting any connections, thoroughly read the following
subsections, then choose the section that best describes your
equipment.

Tip: Peripherals directly connected to the ATR8000 are more
efficient, especially in the CP/M mode.  This is because CP/M
software is more sophisticated, allowing faster printing, better
modem transmission and faster disk I/O.


II.4.A.  ATARI, ATR8000, 1+ Standard Drives, ATR8000 Cable,
Standard Drive Gable, One 8" Adapter for Each 8" Drive


Connecting the above equipment is straightforward.  When mixing 5
1/4" and 8" drives, decide which drive will be Drive 1 (the drive
from which the system is booted).  For help refer to Section
II.3.A.

All 8" drives must have an adapter that connects them to the
Standard Drive Cable.  Plug the adapter's 50-pin connector onto
the drive (with the connector on the upper side of the adapter
board) and plug the Standard Drive Cable's connector into the
adapter's 34-pin edge connector.

Refer to Section II.1. to learn which pin on each cable is Pin 1.
Refer to Section II.2. to learn which pin on each port is Pin 1.
In connecting cables, make sure that Pin1 on the cable is
connected to Pin 1 on the Port.

MAKE SURE THAT THE POWER IS TURNED OFF AND THE ATR8000 IS
UNPLUGGED BEFORE MAKING ANY CONNECTIONS.  DO NOT REPOWER THE
SYSTEM BEFORE YOU HAVE COMPLETED ALL SUBSECTIONS IN SECTION II.

DIAGRAM 10A:The ATR8000 back panel(see I.1.)

DIAGRAM 10B: Making the Connections (for II.4.A.)


         SIO Cable             Standard Drive Cable
         |-----|       |------------------------------|
|-----|  |   |-+-+-++-++-++-|  |------|------|------|-|
|     |<-|   |              |  |      |      |      |
|     |      |              |  D1     D2     D3     D4
|-----|      |--------------|     5 1/4", 8", or 3.5"
 Atari          ATR8000(top)



CONNECTIONS: The ATARI is connected from the peripheral port on
the side of the ATARI 800/400 to COMPUTER IN on the ATR8000,
using the ATR8000 cable.  The Standard Drive Cable connects from
the FLOPPY DISK Port of the ATR8000 to the drives.  A 4-connector
Standard Drive Cable is pictured.  Connection using the 2-
connector cable is the same.  TO AVOID INTERFERENCE WITHIN THE
SYSTEM, KEEP ALL I/O CABLES AWAY FROM THE ATR8000's POWER CORD.

There must be a drive connected on the Standard Drive Cable's
connector that is furthest from the ATR8000 connector (where
Drive 1 is pictured above).  The above diagram shows one method of
drive numbering; drive numbers can be set in any order -- they do
not have to be 1,2,3,4; they could be 4,3,2,1 or any other
combination.  Section II.6.  explains this in greater detail and
tells how to internally configure drives for drive number.  When
all peripherals and cables are connected, go to Section II.5.

                                                                      [27]


II.4.B.  ATARI, ATR8000, 1+ Standard Drives, 1+ ATARI 810 Drives,
ATR8000 Cable, ATARI Daisy Chain Cable, Standard Drive
Cable, One Adapter for Each 8" Drive.


Information on mixing types of drives is in Section II.3. Cable
information is in Section II.1.  ATR8000 Port information is in
Section II.2.  Familiarize yourself with all the above information
before making any connections.  For a detailed diagram showing, the
locations of the ATR8000's ports, refer to DIAGRAM I.1.

MAKE SURE THAT THE POWER IS TURNED OFF AND THE ATR8000 IS
UNPLUGGED BEFORE MAKING ANY CONNECTIONS.  DO NOT REPOWER THE
SYSTEM BEFORE YOU HAVE COMPLETED ALL SUBSECTIONS IN SECTION II.



DIAGRAM 10C: Making the Connections (for II.4.B.)

                     Atari SIO Cable(Daisy Chain)
                 |--------------------------------|
                 |  |-------|------|------|-------|  --|--|--|--|
                 |  |       |      |      |            5  6  7  8
                 |  A       B      C      D          (Atari drives only)
                 |
      SIO Cable  |             Standard Drive Cable
         |-----| |     |------------------------------|
|-----|  |   |-+-+-++-++-++-|  |------|------|------|-|
|     |<-|   |              |  |      |      |      |
|     |      |              |  A      B      C      D 
|-----|      |--------------|
 Atari          ATR8000(top)


The ATARI Daisy Chain Cable Standard Drive Cable and the 
Standard Drive Cable are shown for concept only.
There can only be a total of four drives(one for each letter position
A, B, C, D).  Each cable could have any number of connectors and/or as
drive numbers are set internally (see Section II.6.).


IMPORTANT:
There can only be one drive in each drive position.  For example,
if a drive is connected as Drive 1 on the Standard Drive Cable, a
drive cannot be configured to be Drive 1 on the ATARI Daisy Chain
Cable.  There must be a drive connected on the Standard Drive
Cable's last connector (connector furthest from the ATR8000,
Drive 1 above).

CONNECTIONS:
The ATARI is connected from its peripheral port (on the right
side of the ATARI computer console) to the COMPUTER IN Port of
the ATR8000, using the ATR8000 cable.  The ATARI Daisy Chain Cable
connects to the PERIPHERAL OUT Port on the ATR8000.  The Standard
Drive Cable connects to the FLOPPY DISK Port of the ATR8000.
KEEP ALL I/O CABLES AWAY FROM THE ATR8000 POWER CORD.

After connecting all peripherals, go to Section II.5.  and then to
the other subsections in Section II.  DO NOT REPOWER THE ATR8000
SYSTEM UNTIL ALL SEVEN SUBSECTIONS OF THE HARDWARE CONNECTION
SECTION HAVE BEEN COMPLETED.

                                                                      [28]

II.4.C.  ATARI, ATR8000, 1+ Standard Drives, 1+ ATARI 810 Drives,
Printer, Modem, ATARI 850 Box, ATR8000 Cable, Standard
Drive Cable, ATARI Daisy Chain Cable, One 8" Adapter for
Each 8" Drive.


There are many ways to connect all or most of the above
equipment.  Before reading this section, read Section II.3.  to
learn about all the peripherals and the best way to connect them.
Also read Sections II.1.  and II.2.  to learn where Pin 1 is
located on both the cables and the ports.  Pin 1s must match for
proper connections.  Follow the diagram below that best matches
your equipment.



MAKE SURE THAT THE POWER IS TURNED OFF AND THE ATR8000 IS
UNPLUGGED BEFORE MAKING ANY CONNECTIONS.  DO NOT REPOWER THE
SYSTEM BEFORE YOU HAVE COMPLETED ALL SUBSECTIONS IN SECTION II.
                                                                      [29]


II.4.C1.  Connection Without the 850

DIAGRAM 10D: Making the Connections (for II.4.C1.)


                     Atari SIO Cable(Daisy Chain)
                 |--------------------------------|
                 |  |-------|------|------|-------|  --|--|--|--|
                 |  |       |      |      |            5  6  7  8
                 |  A       B      C      D          (Atari drives only)
                 |  
                 |  |-Parallel Printer
                 |  |
      SIO Cable  |  |          Standard Drive Cable
         |-----| |  |  |------------------------------|
         |     | |  |  |  |--|                        |
|-----|  |   |-+-+-++-++-++-|| |------|------|------|-|
|     |<-|   |              || |      |      |      |
|     |      |              || A      B      C      D 
|-----|      |--------------||
 Atari          ATR8000(top) |-Modem


NOTES: If you connect a serial printer, the modem will have to be
disconnected to use the printer.  To use both peripherals at the
same time, connect a parallel printer.

There can only be a total of four disk drives.  ATARI 810 drives
and standard drives are configured for drive number by setting
internal switches.  The drive cables showing four connectors are
only for concept.  There must be a drive connected to the last
connector on the Standard Drive Cable (Drive 1 above).

CONNECTIONS:
The ATARI is connected to the COMPUTER IN Port of the ATR8000,
using the ATR8000 cable.  The ATARI Daisy Chain Cable is connected
to the PERIPHERAL OUT Port of the ATR8000.  The Parallel Printer
Cable is connected to the PRINTER Port (a parallel port).  The
Standard Drive Cable is connected to the FLOPPY DISK Port.  The
modem is connected to the RS-232 Port.  KEEP ALL I/O CABLES AWAY
FROM THE POWER CORD OF THE ATR8000.

After making all connections, go to Section II.5.  and continue
following all other subsections in Section II before repowering
the system.

                                                                      [30]


II.4.C2.  Connection With the 850

The 830 ATARI Modem can be connected to the ATARI 850 Interface
Module instead of to the ATR8000.  However, to be used with CP/M,
peripherals must be directly connected to the ATR8000, not
through an 850.  (Reread Section II.3.  for further details.)

The ATARI is connected to the 850 which is connected to the
ATR8000 COMPUTER IN Port.  Then, the modem is connected to the
850.

MAKE SURE THAT THE POWER IS TURNED OFF AND THE ATR8000 IS
UNPLUGGED BEFORE MAKING ANY CONNECTIONS.  DO NOT REPOWER THE
SYSTEM BEFORE YOU HAVE COMPLETED ALL SUBSECTIONS IN SECTION II.

 DIAGRAM l0E: Making the Connections (for II.4.C2.)


    830 Modem-|      
              |      Atari SIO Cable(Daisy Chain)
    |-----|   |  |--------------------------------|
Parallel|------| |  |-------|------|------|-------|  --|--|--|--|
Printer |  850 | |  |       |      |      |            5  6  7  8
        |------| |  A       B      C      D          (Atari drives only)
           |  |  |
         |-|  || |             Standard Drive Cable
         |     | |     |------------------------------|
|-----|  |   |-+-+-++-++-++-|  |------|------|------|-|
|     |<-|   |              |  |      |      |      |
|     |      |              |  A      B      C      D 
|-----|      |--------------|
 Atari          ATR8000(top)



NOTE: Only ATARI DOS and OSA+ printing can be done
when the printer is connected to the 850.  The 850 must be 5 1/4"
disconnected and the printer 8" must be connected to the ATR8000
Drives for CP/M printing.


NOTE: For CP/M a modem must be connected directly to the ATR8000.
Remember that the ATARI Daisy Chain Cable and the Standard Drive
Cable are shown only for concept.  Drive numbering is done
internally.  There must be a drive connected on the last connector
on the Standard Drive Cable (Drive 1 above).  Drive numbers must
be unique.

CONNECTIONS:
The ATARI is connected to the 850 which is connected to the
COMPUTER IN Port of the ATR8000.  The 830 Modem is connected to
the 850.  The ATARI Daisy Chain Cable is connected to the
PERIPHERAL OUT Port.  The parallel printer is connected to the
850.  The Standard Drive Cable is connected to the FLOPPY DISK
Port.  KEEP ALL I/O CABLES AWAY FROM THE ATR8000's POWER CORD.

                                                                      [31]


II.4.C3.  Connecting a 40 Column Printer


A 40 column printer is connected on the ATARI Daisy Chain Cable.
The 810 drive (or drives) are also on this cable.   Remember that a
40 column printer cannot be used with CP/M.

Make sure that Pin 1 on each cable is connected to Pin 1 on the
port the cable connects to.  See Sections II.1.  and II.2.  for
details.

MAKE SURE THAT THE POWER IS TURNED OFF AND THE ATR8000 IS
UNPLUGGED BEFORE MAKING ANY CONNECTIONS.  DO NOT REPOWER THE
SYSTEM BEFORE YOU HAVE COMPLETED ALL SUBSECTIONS IN SECTION II.


DIAGRAM 1OF: Making the Connections (for II.4.C3.)

                     Atari SIO Cable(Daisy Chain)
                 |--------------------------------|
                 |                 |------|-------| 
                 |                 |      |    
                 |                 Drive  820/822 Printer
                 |
      SIO Cable  |             Standard Drive Cable
         |-----| |     |------------------------------|
|-----|  |   |-+-+-++-++-++-|  |------|------|------|-|
|     |<-|   |              |  |      |      |      |
|     |      |              |  A      B      C      D 
|-----|      |--------------|
 Atari          ATR8000(top)



NOTE: The 820/822 can only be used to print under ATARI
DOS or OSA+.



CONNECTIONS:
The ATARI is connected to the COMPUTER IN Port of the ATR8000,
using the ATR8000 cable.  The ATARI Daisy Chain Cable is
connected to the PERIPHERAL OUT Port.  The Standard Drive Cable is
connected to the FLOPPY DISK Port.

After making all connections, go to Section II.5.  and continue
following all other subsections in Section II before repowering
the system.


II.4.D.  Other Connections

If your equipment does not directly match one of the above
connection sections, then merge the portions of the various
sections that describe your equipment.  Follow the guidelines
for limitations that some connections will incur.  As a rule,
whenever possible, connect directly to the ports of the ATR8000.

                                                                      [33]


II.5.  ATR8000 Jumper Options

The circuit board of the ATR8000 has 12 jumper options.  For the
positions of these jumper options, refer to the diagram of the
circuit board on the opposite page.  Before making any jumper
changes, turn the ATR8000's power off and unplug the unit.  The
jumper options and the meaning of the configurations are
explained below.

II.5.  A.  16k or 64k -- J1, J2, J3, J4, J5, J6, J8

These jumper options determine whether the ATR8000 has 16k or 64k
of RAM.  The following diagram shows the proper configuration for
each.  A bar between two points indicates a connection; no bar
means the space is open.  The default for these jumpers is for 16k
of RAM.  If you purchased a 16k ATR8000, these default connections
are traces on the circuit board.

DIAGRAM 12: 16 or 64k -- J1, J2, J3, J4, J5, J6, J8

For 16k ATR8000:

       J1     J2      J3      J4     J5     J6      J8
      o--o   1o  o2    o       o      o      o     o  o
             3o--o4    |       |      |      | 
             5o--o6    o       o      o      o

For 64k ATR8000:

       J1     J2      J3      J4      J5      J6      J8
      o  o  1o--o2     o       o       o       o     o--o
            3o  o4
            5o  o6     o       o       o       o


Notice that the 64k jumpers are the exact opposite of the 16k
jumpers.  If you are changing the ATR8000 from 16k to 64k, cut the
circuit board traces, making sure to fully break the traces, then
make the proper jumper connections.  Further instructions for
converting the ATR8000 to 64k are in Section V.1.

TURN THE POWER OFF THE ATR8000 AND UNPLUG IT BEFORE MAKING ANY
CHANGES.  DO NOT TURN THE POWER BACK ON THE SYSTEM UNTIL ALL
JUMPERS CHANGES ARE COMPLETED AND DOUBLE-CHECKED FOR ACCURACY.  IF
YOU DO NOT MAKE THESE CHANGES PROPERLY, THE ATR8000 MAY BE
DAMAGED.

II.5.B.  ATARI or RS-232 Terminal -- J7, J10

The configurations of these jumpers depend on whether an ATARI or
an RS-232 terminal is connected to the ATR8000 at the COMPUTER IN

II.5.B.  ATARI or RS-232 Terminal -- J7, J10

The configurations of these jumpers depend on whether an ATARI or
an RS-232 terminal is connected to the ATR8000 at the COMPUTER IN
Port.  An RS-232 terminal may be connected (in place of the ATARI)
to the 64k ATR8000.  (There are no handshake lines for the RS-232
terminal.) For other information about connecting an RS-232
terminal, refer to Section II.7.

The standard ATR8000 circuit board is configured for the ATARI.

DIAGRAM 13: ATARI or RS-232 Terminal -- J7, J10

ATARI:
   J7     J10
 1o  o2    1o
  |  |      |
 3o  o4    2o

 5o  o6    3o 

RS-232 Terminal:
   J7     J10
 1o  o2    1o

 3o  o4    2o
  |  |      |
 5o  o6    3o 

To convert the ATR8000 to connect a RS-232 terminal, cut the
"ATARI" traces on the circuit board, making sure to fully break
the traces, then make the proper jumper connections.

TURN THE POWER OFF THE ATR8000 AND UNPLUG IT BEFORE MAKING ANY
CHANGES.   DO NOT TURN THE POWER BACK ON THE SYSTEM UNTIL ALL
JUMPERS CHANGES ARE COMPLETED AND DOUBLE-CHECKED FOR ACCURACY.  IF
YOU DO NOT MAKE THESE CHANGES PROPERLY, THE ATR8000 MAY BE
DAMAGED.

If you plan to switch between using an ATARI and a RS-232
terminal with the ATR8000, use a 3 pole double pole switch.

                                                                      [34]


II.5.C.  2k or 4k Operating ROM -- J9

This jumper option relates to the operating ROM.  The ATR8000
comes with a 4k operating ROM, so the default configuration is
set for the 4k ROM.

DIAGRAM 14: 2k or 4k Operating ROM -- J9

4k (2732):
     J9
    o o-o
    1 2 3


2k (2716):
     J9
    o-o o
    1 2 3




                                                                      [35]


II.5.D.  RS-232 Configuring -- J12

This is the most complex of the jumper options.  The configuration
of this jumper option depends on what peripheral is run from the
RS-232 Port of the ATR8000.  Look at the diagram of J12 below.


DIAGRAM 15: RS-232 Configuring -- J12

                                        DB 25 Pins

Ring Detect ---------------------------------- 22
 
 Signal Ground -------------------------------  7
                               J12
                        ---------------
 Computer Handshake In  |1   o-| o  16| ------ 11
                        |      |      |
                  (out) |2 |-o | o  15| ------ 20
                        |  |   |      |
                   (in) |3 | o-| o  14| ------  8
                        |  | |        |
                   (in) |4 | o   o  13| ------  6
                        |  | |        |
                   (in) |5 | o   o  12| ------  5
                        |  |          |
 Computer Handshake Out |6 |-o   o  11| ------  4
                        |             |  
     Receive Data       |7   o   o  10| ------  3 
                        |             |
     Transmit Data      |8   o   o   9| ------  2
                        ---------------
ATR8000 computer                               DB25 connector pins


Notice that the left side of J12 (Pins 1-8) has ATR8000 signals
coming into it.  When pins from the left side are connected to
pins on the right side of J12 (Pins 9-16), the signals are sent
across the jumper option to go to the DB 25 connector that
interfaces the peripheral to the RS-232 Port.

The configuration of J12 depends upon what the connected RS-232
peripheral needs.  Some sample configurations are shown below.  To
connect a peripheral not listed below, consult the connection
section of that peripherals manual to see what signals need to
be interfaced.  Rely on the diagram above to see what pins of the
DB 25 connector are connected to Pins 9-16 of J12.

The default for J12 is configured to run an Epson serial printer.

BEFORE MAKING ANY CHANGES, TURN OFF THE POWER AND UNPLUG THE
ATR8000.


DIAGRAM 15A: Configuration of J12 to Connect an Epson Serial
Printer (the Default)
                               J12
                        ---------------
 Computer Handshake In  |1   o   o  16| ------ 11
                        |             |
                  (out) |2   o\ /o  15| ------ 20
                        |      X      |
                   (in) |3   o/ \o  14| ------  8
                        |             |
                   (in) |4   o   o  13| ------  6
                        |             |
                   (in) |5   o   o  12| ------  5
                        |             |
 Computer Handshake Out |6   o   o  11| ------  4
                        |             |  
     Receive Data       |7   o\ /o  10| ------  3 
                        |      X      |
     Transmit Data      |8   o/ \o   9| ------  2
                        ---------------



DIAGRAM 15B:Configuration of J12 to Connect a RS-232 Terminal to
 the RS-232 Port to Communicate with the ATARI

                               J12
                        ---------------
 Computer Handshake In  |1   o   o  16| ------ 11
                        |             |
                  (out) |2   o   o  15| ------ 20
                        |             |
                   (in) |3   o   o  14| ------  8
                        |             |
                   (in) |4   o   o  13| ------  6
                        |             |
                   (in) |5   o   o  12| ------  5
                        |             |
 Computer Handshake Out |6   o   o  11| ------  4
                        |             |  
     Receive Data       |7   o\ /o  10| ------  3 
                        |      X      |
     Transmit Data      |8   o/ \o   9| ------  2
                        ---------------



DIAGRAM 15C: Configuration of J12 to Connect the D.C.  Hayes Smart
Modem to the RS-232 Port
                               J12
                        ---------------
 Computer Handshake In  |1   o   o  16| ------ 11
                        |             |
                  (out) |2   o---o  15| ------ 20
                        |             |
                   (in) |3   o---o  14| ------  8
                        |             |
                   (in) |4   o   o  13| ------  6
                        |             |
                   (in) |5   o   o  12| ------  5
                        |             |
 Computer Handshake Out |6   o   o  11| ------  4
                        |             |  
     Receive Data       |7   o---o  10| ------  3 
                        |             |
     Transmit Data      |8   o---o   9| ------  2
                        ---------------


                                                                      [37]


II.5.E.  Undefined --  J11

This jumper option is not defined at this time.  If you plan to
use burg pins and shunts on any jumper options and aren't sure
what they look like, look at J1 1 as it has burg pins and a shunt
in it.

DIAGRAM 16: Undefined --  J11

    J11
      o
      o


                                                                      [38]


II.6.  Internal Drive Configuring

This subsection details how to internally configure drives that
are connected to the ATR8000.  Before turning the power on the
ATR8000 systems first follow these instructions for "setting up"
your disk drives.  (You should have decided drive numbers as you
connected the drives in Subsection 4 above.)


II.6.A.  5 1/4" Drives:

The following diagram is for reference purposes.  It shows the
position of the terminating resistor pack and jumper options in a
Tandon 5 1/4" disk drive.  Your drives may be a different brand
(i.e., Shugart, MPI, etc.) but they will have these components in
a similar position.


DIAGRAM 17: Locations for Internal Drive Configuring

FRONT
|
|
|
|
|  |------------|
|  |  ||||||||  | Jumpers
|  |------------|
|
|           |-------| Terminating Resistor Pack
|           |-------|
|
|            |-|
|------------| |---------------------------
(data)                                   (power)
(Connector)

BACK




Terminating Resistor Pack:

The drive that is connected to the last connector on the Standard
Drive Cable (the drive connector furthest from the ATR8000; the
2nd connector on the 2-connector cable,the 4th on the 4-
connector cable) must have a terminating resistor pack in it.  No
other disk drive on the cable should have a terminating resistor
pack, if they do, remove the pack and store it.  (This should be
in a socket.)

The last connector on the cable should always have a drive
connected to it.  If you only have one drive on this cable, plug
it into the last connector and leave the middle connectors open.

Diagram 17 shows the location of this resistor pack for a Tandon
disk drive.  If you have a different brand of drive, look for it
in a similar position (it should be socketed), or consult the
operating manual for the drive for the location.


Jumper Options:

Each drive must have the jumper options set correctly.  The
location of the jumper options on a Tandon drive are shown on the
previous page.  The drivers circuit board should be marked for
options.  The following are the options for a Tandon drive.


 DIAGRAM 18: Jumper Options for 5 1/4" Drives

 --U--
 | o |   HS------ Head Load with Drive Select
 | o |   DS0 ---- Drive Select 0 (for Drive 1)
 | o |   DS1 ---- Drive Select 1 (for Drive 2)
 | o |   DS2 ---- Drive Select 2 (for Drive 3)
 | o |   DS3 ---- Drive Select 3 (for Drive 4)
 | o |   MX------ Multiplex
 | o |   Spare--- No function
 | o |   HM------ Head Load with Motor On
 -----

On most drives, the jumper options have a dip shunt connecting
them.  This is a "box" that has a plugged hole at each option,
connecting signals from the incoming side of the box to the
outgoing side.  Punching out a hole (disconnecting the connection)
disengages that option.  A plug in the hole means that the option
is active.

You may want to remove this dip shunt and replace it with a dip
switch shunt.  This box will have switches that are set to the
left or to the right, turning an option on or off.  This type of
shunt makes it easier to renumber a drive, whereas, the straight
dip shunt is harder to change.

Before setting these jumper options, determine what the drive
number of each drive will be.  (You should have already decided
this in making the hardware connections.)  There must be a drive
connected to the last connector on the Standard Drive Cable.  It
can be set to be any drive number.

Look at the following example:

DIAGRAM 19: Drive Numbering #1

ATR8000---------------------------|
                   |    |    |    | 
                                  D1 or D2


The drive on the last connector of the 4-connector cable shown,
could be set to be either Drive 1 or Drive 2.  Select the
numbering system (i.e., 1,2,3,4 or 4,3,2,1) that suits you.  It
may help to place a small sticker on the front of each drive to
indicate the drive number.  The cable can also be looped so that
the last connector on the cable is connected to Drive 1 and the
drive numbers are in ascending order:


DIAGRAM 20: Drive Numbering #2



ATR8000---------------------------|
                   |----|----|----|
                   |    |    |    | 
                   D1   D2



Regardless of the order you choose to number the drives, the
drive on the last connector must have the terminating resistor
pack in it.  (Drive 1 in DIAGRAM 20.)

A Tandon drive (5 1/4") needs the following options set active
(plugs in):

HN and one of the four Drive Selects.  (Be careful to set
unique drive numbers.  Remember that a standard drive cannot
have the same number assigned to an 810 on the ATARI Daisy
Chain Cable).  All other options need to be off (if using a
dip shunt, the hole needs to be punched out).  If using
multiple drives, it is important that MX is open because this
allows the input/output lines to be multiplexed.


Special Considerations for 5 1/4" Drives:

Some Tandon and MPI disk drives do not have head load solenoids.
For these drives, only set a drive select to be active.


                                                                      [41]


II.6.A1.  Radio Shack Drives:

Some Radio Shack drives are nonstandard.  The TRS 80 Model I
drives have Drive Select 3 connected where side select is
connected on standard microfloppies.  This needs to be changed.
There will be a blue wire connecting DS 3 to Pin 32 on a
conductor pad of the drivers edge connector.  (Follow the trace
wire from the jumper option to the edge connector.)  This wire
needs to be disconnected and soldered to the pad going to Pin 6
of the edge connector.  [Our system uses conductor 32 for side
select.  This is shown in the FLOPPY DISK Port definitions in
Section II.2.B.]

If using a Radio Shack drive cable,drives are configured
differently than described above.  Their cables are constructed so
that drive select is determined by the connectors on the cable.
Their first connector makes the drive plugged into it Drive 1,
the second Drive 2, and so on.  Because the drive number is
determined by position on the cable, all four drive selects are
plugged active on all the drives.  This way, any drive can be
reconnected to another connector without changing jumper options.

When using TRS-80 Model I drives on a non-Radio Shack cable, use
standard configurations.  External Model III drives are standard
drives, i.e., the DS 3 and Side Select are in the standard
positions.


II.6.A2.  ATARI 810 Drives:

When using ATARI 810 drives with the ATR8000, connect them to the
ATARI Daisy Chain Cable.  Decide what drive numbers the drives
will be and consult the ATARI 810 drive manual for instructions
on how to configure the 810 to be a particular drive number.  MAKE
SURE THAT YOU DO NOT HAVE MORE THAN ONE ATARI OR STANDARD DRIVE
ASSIGNED FOR EACH POSSIBLE DRIVE NUMBER (1-4).


II.6.A3.  Percom Drives:

Percom ATARI Controller drives can be used on the ATARI Daisy
Chain Cable for operating under ATARI or OSA+ DOSes.  To operate
under CP/M, unplug the controller card, then connect the drive to
the Standard Drive Cable, plugging the cable's connector onto the
edge connector of the drive.  (Detailed information and a diagram
are in Section II.3.2.) Percom add-on drives are standard drives.

For information about internally configuring the drive for drive
number, consult the Percom ATARI Controller manual.

                                                                       [42]


II.6.B.  8" Drives:

8" drives are configured like 5 1/4" drives.  The terminal
resistor information is the same as for 5 1/4", drives.  Refer to
the 5 1/4" internal configuring information for details.

Rather than having the jumper options in one place (like the 5
1/4" drives),8" drives have these options in segments in
different locations on the board.  For their locations, consult a
drive manual.  As with the 5 1/4" drives, one drive select needs
to be active for each drive.


8" Drive Configurations for Shugart 800s and 801s:

For this description, jumper means connected (active), open means
disconnected.

Jumper Tl, T2, T3, T4, T5, and T6 on the drive connected to the
last connector on the cable.  These are the terminating
resistors.  (T2 is the drive select pullup resistor.)

On all other drives, jumper T2 and leave Tl, T3, T4, T5
and T6 open.

Jumper one drive select (DS 1 , DS 2, DS 3, or DS 4), have the
others open.

Open B.

Jumper HL, Z, A, C, X*.

Jumpering X with B open allows the heads to stay loaded
when the system switches between drives.  This saves head
wear-and-tear and quiets the drive noise caused by head-
banging.  It is possible to Jumper B and Open X.

If your power supply can only handle one drive at a time,
do not have X jumpered and B open or you'll blow the power
supply.  If the power supply can only handle one drive at
a time, Jumper B and Open X.


                                                                      [43]


II.7.  Connecting a RS-232 Terminal to the ATR8000

A RS-232 terminal may be connected to the 64k ATR8000 in place of
the ATARI.  A terminal will run CP/M software.  (Since it is not an
ATARI, it will not run ATARI DOS or OSA+.) To connect a terminal,
follow the steps below.

STEP 1: Turn off the power on the ATR8000 and unplug it from the
electrical socket before continuing.

STEP 2: Make the changes in J7 and J10 as shown in Section
II.5.B.  If you plan to switch back and forth between
using the ATR8000 with a terminal and with the ATARI,
install burgs and shunts to facilitate the switching.

STEP 3: Purchase a special terminal cable from SWP.  This cable
has an "ATARI" connector on one end that plugs into the
COMPUTER IN Port of the ATR8000.  The other end of the
cable connects to the terminal.  Connect the cable.

STEP 4: Double check to insure that the jumpers are correct and
that the cable is properly connected before repowering
and plugging in the ATR8000.

                                                                      [44]


III.  Software

This section is divided into three subsections, one for each DOS
that can be used with the ATR8000 (ATARI DOS, OS/A+ (Ver.  4), and
CP/M).  Each of these sections is a supplement to each DOS's
separate operating manual.

Booting and operating instructions for ATARI DOS and OS/A+ are in
their separate operating manuals.  Subsection 3 contains booting
information for the ATR8000 CP/M and contains operating
instructions for ATR8000 CP/M programs.  A separate CP/M manual is
included which explains how to use CP/M and its utility programs.

Under ATARI DOS and OS/A+ the ATR8000 is a slave processor to the
ATARI.  It operates as a double density disk interface and can run
printers or modems.  To run CP/M, the 64k ATR8000 transmits a
terminal program to the ATARI, then takes control of the system.
The CP/M subsection includes diagrams listing keyboard and
display character codes, as well as control and escape sequences
used for CP/M.


III.1.  ATARI DOS

ATARI DOS will run normally, i.e., as it ran on the ATARI before
the ATR8000 was connected.  This DOS (on a 5 1/4" disk) can be
booted from a standard 5 1/4" drive as well as from an ATARI 810.

As Section II.3.A.  explains, it is possible to run this DOS from
an 8" drive.  This will only access 720 of the possible 2002
sectors on the disk.  Although this can be a disadvantage because
all of the available disk space cannot be used, it saves having
to reconfigure the disk drives when changing DOSes.

To copy ATARI DOS to an 8" disk, first connect the drives so that
a standard 5 1/4" or an 810 drive is Drive 1 and an 8" drive is
another drive number.  Then follow the ATARIDOS procedure for
making a systems disk from your master disk.  If you are unsure
about how to do this, follow the steps below.


III.1.A.  Copying ATARI DOS to an 8n Disk

STEP 1: Connect the disk drives so that an 810 or a standard 5
1/4" drive is Drive 1 and an 8" drive is Drive 2.  (For
help refer to Section II.)

STEP 2: Turn the power on the system (ATARI, ATR8000, drives,
etc.).  If the ATARI BASIC cartridge is in the ATARI, the
READY prompt will appear.  Type DOS and press <RETURN>.
(If no BASIC cartridge is in the ATARI, the DOS menu
will automatically appear on the screen.)

STEP 3: We are now going to format the 8" disk that the ATARI
DOS will be written onto.  Type I for the FORMAT option.
When asked which drive to format, type 2 and press
<RETURN>.  Insert a blank 8" disk into Drive 2 and close
the drive door.

STEP 4: When prompted to TYPE Y TO FORMAT DISK 2, type Y and
press <RETURN>.When the formatting is complete, the
message SELECT ITEM OR RETURN FOR MENU will appear on
the screen.

STEP 5: We are now ready to copy the DOS onto the formatted 8"
disk.  Type H and press <RETURN> to select the WRITE DOS
FILES option.

STEP 6: When asked which disk to write the files to, type 2 and
press <RETURN>.  When asked for verification, type Y and
<RETURN>.

STEP 7: When the operation is complete, the message SELECT ITEM
OR RETURN FOR MENU will reappear on the screen.  At this
point you can write the MEM.SAV file on the disk as the
ATARI DOS manual recommends.  To do this, type N and
press <RETURN> (for CREATE MEM.SAV).  Then type Y and
press <RETURN>.  When the computer is through, the
message SELECT ITEM OR RETURN FOR MENU will reappear on
the screen.

STEP 8: Done!

                                                                      [45]


III.1.B.  Modems

To run a modem from the ATR8000's RS-232 Port, use Software
Publishers' Custom Modem software.  This software will run modems
under ATARI DOS, OS/A+ and CP/M.

An ATARI 830 Modem may be run through an ATARI 850 Interface
Module.  For MODEM PRINTING, the 80 column printer must be
connected to the 850 and the SWP BASIC program, PRINTOFF.BAS,
must be run before printing.

When connected, printer command acknowledgements are sent to the
computer from both the 850 and the ATR8000.  PRINTOFF.BAS (an ATARI
BASIC program) disables the ATR8000's printer driver so that it
won't interfere with the signals between the 850 and the computer.


                                                                      [46]


III.1.C.  Printers

There are several considerations for connecting a printer to
operate with ATARI DOS.

1)820/822 Printers:  Either of these 40 column ATARI
printers is connected to the ATARI Daisy Chain Cable.
Before printing, the PRINTER Port of the ATR8000 must be
told not to interfere; therefore, PRINTOFF.BAS is run.

To turn the ATR8000's PRINTER Port back on, you can
either reboot the computer, or run PRINTON.BAS.

2) Printing While Using the 830 Modem if the ATARI 850
Interface module is connected to the System: If the 850
has been connected to run the ATARI 830 Modem, then to
print data received through the modem, the printer must
be connected to the 850 box and PRINTOFF.BAS must be run
so the ATR8000 won't interfere with the operation.

If the 830 Modem isn't being used at the time of
printing, but it is connected to the ATR8000 system,
there are two ways to use an 80 column printer for ATARI
DOS:

1) Disconnect the 850 and have the printer connected to
the ATR8000's PRINTER Port.

2) Connect the printer to the ATARI 850 and run
PRINTOFF.BAS before printing.

As with ATARI operation, an 820/822 printer will not
operate if an 850 is connected to the system.


                                                                      [47]


III.1.C1.  PRINTOFF.BAS

Using ATARI BASIC, enter this BASIC program as listed below.  It
will disable the ATR8000's printer driver to allow the 850 box
to run the printer.  (As described later, it also is used to run
an 820/822printer from the ATARI Daisy Chain Cable).
PRINTOFF.BAS will have to be rerun if the computer is rebooted or
after PRINTON.BAS is run.

Run PRINTOFF.BAS before printing.[From ATARI BASIC,type:
RUNIID:PRINTOFF.BAS<RETURN>.  The computer will respond: PRINTER
OFF.  If you attempt to print from the ATR8000's PRINTER Port
while PRINTOFF.BAS is active, ERROR 138 will show on the screen.


100 REM <<PRINTOFF.BAS)>>
110 DIM BUF$(3)
120 Z=ADR("     ")
130 DATA 104,76,89,228
140 FOR I=0 TO 3
150 READ X
160 POKE Z+I,X
170 NEXT I
180 DCB=7,68
190 DATA 90,1,83,0,0,0,1,0,3,0,54,255
200 FOR I=0 TO 11
210 READ X
220 POKE DCB+I,X
230 NEXT I
240 X=USR(Z)
250 A=ADR(BUF$)
260 X=INT(A/256)
270 POKE DCB+5,X
280 POKE DCB+4,A-X*256
290 GOSUB 2000
300 POKE DCB+2,ASC("S")
310 POKE DCB+3,0
320 D=PEEK(A)
330 POKE DCB+10,D
340 D=PEEK(A+1)
350 POKE DCB+11,D
360 X=USR(Z)
370 GOSUB 2000
380 POKE A+2,255:rem 255=off
390 POKE DCB+2,ASC("W")
400 POKE DCB+3,128
410 X=USR(Z)
420 PRINT "PRINTER OFF"
430 END
2000 POKE DCB+2,ASC("R")
2010 POKE DCB+3,64
2020 POKE DCB+10,3
2030 X=USR(Z)
2040 RETURN

                                                                      [48]

III.1.C2.  PRINTON.BAS

This program reactivates the printer driver of the ATR8000 after
it has been disabled by PRINTOFF.BAS.  (If the computer is
rebooted, there is no need to run PRINTON.BAS.)

Under ATARI DOS, enter this program as listed below.  To run it,
type: RUNIID:PRINTON.BAS<RETURN>.  The system will respond: PRINTER
ON.



100 REM <<PRINTON.BAS>>>
110 DIM BUF$(3)
120 Z=ADR("     ")
130 DATA 104,76,89,228
140 FOR I=0 TO 3
150 READ X
160 POKE Z+I,X
170 NEXT I
180 DCB=768
190 DATA 90,1,83,0,0,0,1,0,3,0,54,255
200 FOR I=O TO 11
210 READ X
220 POKE DCB+I,X
230 NEXT I
240 X=USR(Z)
250 A=ADR(BUF$)
260 X=INT(A/256)
270 POKE DCB+5,X
280 POKE DCB+4,A-X*256
290 GOSUB 2000
300 POKE DCB+2,ASC("S")
310 POKE DCB+3,0
320 D=PEEK(A)
330 POKE DCB+1O,D
340 D=PEEK(A+1)
350 POKE DCB+11,D
360 X=USR(Z)
370 GOSUB 2000
380 POKE A+2,64
390 POKE DCB+2,ASC("W")
400 POKE DCB+3,128
410 X=USR(Z)
420 PRINT "PRINTER ON"
430 END
2000 POKE DCB+2,ASC("R")
2010 POKE DCB+3,64
2020 POKE DCB+10,3
2030 X=USR(Z)
2040 RETURN


                                                                      [49]

III.2.  OS/A+ (Version 4)

OS/A+ (Ver.4) is available on both 5 1/4" and 8" disks.  It
operates on any standard disk drive.  For detailed use on how to
use this DOS, consult the separate OS/A+ operating manual.  The
ATARI must have a minimum of 32k RAM to run OS/A+.

If you are going to run both OS/A+ and CP/M, we suggest that you
have both operating systems on the same size of disk.  This
eliminates having to reconfigure the drive connections before
booting and running the different DOSes.

The stipulations for using printers and modems with OS/A+ are the
same as the ATARI DOS stipulations.  Refer to Section III.1.
(ATARI DOS) for this information.  It is important to thoroughly
understand the conditions that arise when the ATARI 850 is
interfaced to the system.

Wherever possible it is best to directly connect peripherals to
the ATR8000.  This eliminates having to perform special operations
before using the peripherals (such as running PRINTOFF.BAS) and
avoids having to change the connections to use the peripherals
for CP/M.  (Peripherals must be directly connected to the ATR8000
to work with CP/M.)

ATARI 810 drives may be used with OS/A+, but only for single
density operation.  Drive 1 must be a standard drive so that it
can boot this double density DOS.  Then the higher drive number
810s can be used for additional storage (single density).

For booting and operating instructions, refer to the OS/A+
manual.


                                                                      [50]


IV.  Testing the Installed System

Check the ATR8000 system and make sure that all necessary cables
are connected and that drive numbers are unique.  Then turn the
power on the ATR8000, the ATARI (or RS-232 terminal), drives and
any peripherals.  To test ATARI DOS operation, boot the system
using the standard ATARI DOS boot procedure.

To test OS/A+, follow the boot instructions in the OS/A+ manual.
To test CP/M, follow the instruction in Section III.3. of this
manual.

If you have a printer connected to the ATR8000 system, test it
using the print commands of the current operating DOS.  If the
printer doesn't print properly, check the hardware section for
proper connections.  If the printer doesn't work under CP/M and
you changed the default parallel printer driver to another using
CONFIGUR.COM, make sure that the printer's parameter settings
are the same as the parameters of the printer driver.

Try a sampling of DOS commands to test your system.  For instance,
under CP/M type DIR<RETURN> to get a directory listing or
STAT<RETURN> to find out how much disk space remains.  For ATARI
DOS and OS/A+ test similar operations.

That's it!  Refer to the ATARI DOS, the OS/A+, the CP/M and the
ATR8000 instruction manuals for operational details.


                                                                      [51]


V. Expanding the ATR8000

Because of its versatility, the ATR8000 system is capable of
expanding as you can afford to add to it.  To add components to
the ATR8000 after the initial connection, find the hardware
connection section that best describes all of your equipment, and
follow the connection guidelines.  The following subsections
contain tips and instructions.

V.1. Converting to 64k

Read this subsection carefully to convert the 16k ATR8000 to 64k.
If you do not feel competent to make this change (or if you're
unsure), send your ATR8000 to us to have this done.  The charge
for us making the conversion is $20 plus the cost of the upgrade.

To make the conversion:

STEP 1: Turn the power off and unplug the ATR8000. Do NOT repower
or plug in the unit before this entire process has been
completed.

STEP 2: Consult Section II.5.A. and make the necessary changes in
J1, J2, J3, J4, J5, J6, and J8.

STEP 3: Remove the 16k RAM I.C.'s from sockets U1 to U8. These
sockets are directly above J3 - J6 on the ATR8000 circuit
board.  A thin screwdriver blade may be used to gently pry
the chips from the sockets.  Store these chips in the
conductive foam the 64k RAM chips came in.

STEP 4: Put the eight 64k Dynamic RAM chips (200 nanoseconds)
into the now empty U1 - U8 sockets.  Make sure that Pin 1
on each chip (marked by a small circle in the upper left
corner or by a semicircular notch cut in the upper edge
of the chip) is placed in the socket so that it matches
Pin 1 on the socket (marked by a semicircular cut in the
upper edge of the socket).  Pin 1 on the sockets and the
64k DRAMs should point towards the white letters
denoting U1 - U8 on the ATR8000 circuit board.

STEP 5: Carefully inspect the circuit board to insure that the
above procedure was performed EXACTLY.  If you turn the
power on and did not correctly follow this procedure, the
ATR8000 may be damaged.




