Heathkit H 8 1 Manual

Page 1

Heathkit® Manual

for the

4K STATIC MEMORY

Model H8-1

595-2028-01

Copyright © 1971

Heath Company

H EATH C O M PA N Y All Rights Reserved
BENTON HARBOR. MICHIGAN 490 2 2 We in "'9 rm 3'3" °' "9"

Page 2

Page 2
TABLE OF CONTENTS J
Introduction .................................. 2 Specifications ............................... 22
Parts List ..................................... 2 Circuit Description ........................... 23
Step-by-Step Assembly ........................ 4 Integrated Circuit Identification Chart ......... 24
Circuit Board Checks ......................... 11
i Schematic .............................. Fold-in
1 Memory Test Routine ........................ 16
1. Circuit Board X-Ray
: Troubleshooting ............................. 19 View ............... (Illustration Booklet. Page 2)
" INTRODUCTION

The Ha-l 4K Static Memory circuit board uses the
latest in static memories. These memories require a
minimum amount of power while providing fast re«
sponse. This memory circuit board is organized to
allow for the addition of memory in 4K blocks. On-
board jumpers allow you to locate the memory heard
throughout the available memory area. Plug»in capa-
bility combined with low density makes this circuit

board easy to build and service Your H8 Digital
Computer provides for the addition of memory up to
32K»

NOTE: Build your H8 kit first, the memory board
second, and the remainder of the accessories in any
order you desire.

L

PARTS LIST

[ ) Unpack the kit and check each part against the
following list. The key numbers correspond to
the numbers on the Parts Pictorial" [Illustra-
tion Booklet, Page 1). Return any part that is
packed in an individual envelope, with the part
number on it, back in its envelope after you
identify it until that part is called for in a step.

Each circuit part in an electronic kit has its own com-
ponent number (R2 , C4, etc], Use these numbers
when you want to identify the same part in the vari-
ous sections of the Manual. These numbers, which are
especially useful if a part has to be replaced, appear:

- In the Parts List,

0 y. 1/3, A 1 (INCHES)
l "'13/lgmli5l . J 1
I" I .I I

2
I ll I l
0 5 (cwa a 4 s

- At the beginning of each step where a com-
ponent is installed.

- In some illustrations,
- In the Schematic,

- In the section at the rear of the Manual.

To order a replacement part, always include the
PART NUMBER. Use the Parts Order Form furnished
with this kit, If one is not available. see Replacement
Parts" inside the rear cover of your Digital Computer
Assembly Manual. For prices, refer to the separate
Heath Parts Price List."