TABLE OF CONTENTS
Introduction.................................................................. 2
Assembly Notes............................................................ 3
Parts List........................................................................ 6
Step-by-Step Assembly.............................................. 8
Circuit Board Assembly .................................... 8
Circuit Board Checkout.................................... 19
jumper Wire Assembly.................................... 19
Installation and Operation...................................... 20
Initial Tests ......................................................... 21
Status Port ........................................................... 23
ROM Disable (ORG 0)....................................... 24
Side Select........................................................... 28
Modification Tests............................................. 30
Circuit Description .................................................... 31
Circuit Board X-Ray View...................................... 32
Integrated Circuit Identification............................ 33
Schematic .......................................................... Fold-in
Warranty.......................................... Inside front cover
Customer Service............................ Inside rear cover
INTRODUCTION
The Heathkit Model HA8-8 Extended Configuration
Board is designed to operate with the Model H8 Com
puter to provide a general purpose status port, ROM
disable (ORGfl), and side select for double-sided disk
drives.
