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A243   $20.00
       DISK3
TECHNICAL MANUAL




   HARD DISK CONTROLLER
FOR ST -506 COMPATIBLE DRIVES
DISK 3 TECHNICAL MANUAL
Copyright 1983 CompuPro
Hayward, CA 94545

File name: DISK3.MAN
Document # 11945
Board No. 194, Revision G

First edition: October 1983
Latest edition: October 1984



DISCLAIMER - CompuPro makes no representations or warranties
with respect to the contents hereof and specifically disclaims any
implied warranties of merchantability or fitness for any particular
purpose. Further, CompuPro reserves the right to revise this
publication and to make any changes from time to time in the
content hereof without obligation of CompuPro to notify any person
of such revision or changes.

 Trademark: DISK 3; CompuPro.
-Registered Trademark: CP 1M; Digital Research, Inc.

All rights reserved. No part of this publication may be reproduced
or transmitted in any form, or by any means, without the written
permission of CompuPro. Printed and assembled in U.S.A.
                                            CONTENTS

How to get your DISK 3 up and running
  Installation procedures ..................... 1
  Testing ....................................... 6
  Trou bleshooting ............................. 8

DISK 3 Technical Information
  In trod uction ................................ 9
  Hardware interface ........................ 9
  Software overview......................... 10
  Software interface ........................ 10
  Specify format ............................ 16
  Appendix .................................. 17

Hard ware Section
  Logic diagram .......................... 20-23
  Parts list .................................... 24
  Componen t la you t. ......................... 25
HOW TO GET YOUR DISK3 UP AND RUNNING
WITHOUT READING THE MANUAL

Eager to get your new DISK 3 running? Careful installation is
needed to assure proper function of this board.


DISK 3 INSTALLATION PROCEDURES (For use with the CompuPro H40
                                Hard Disk Subsystem.)



STEP 1. UNPACK DISK 3 BOARD.

  Along with the board, you will find
  an extra jumper shun t and two card
  ears in the plastic bag.
                                                    card ear

STEP 2. INSTALL CARD EARS.

a) Hold the board so the component side
   is toward you. (See diagram below.)

b) Insert the peg on the card ear into
   the hole in the right corner of the
   board. Fold the ear over the board's
   edge until the ear's hole snaps over
   the peg (make sure the long edge of
   the ear is along the top edge of the
   board.)

c) Repeat for left ear.




Figure 1: DISK 3 (Component Side)
STEP 3. SET SWICHES.        Check the DISK 3 switch settings (see
       figure below for the location of Sl. We recommend that
       switch positions which are NOT USED be set off. (The
       switch settings are for MP/M 8-16'" Version 2.1 I and
                                      TII


       Concurrent DOS 8-16. Check your software documentation
       for the latest update on the switch settings).

      The black dot (.) shows which side of the switch should be down.
                               S1
      SWITCH 1:                                  POSITION         SET IT
                            OFF ON
                             m:::::J 1          1 ................. OFF
                             c::::m 2           2 ................. ON
                             c:::;:mJ           3 ................. ON
                             m:::::J 4          4 ................. OFF
                             c:::::m 5          5 ........

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