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Radio Shack CCR-81 Technical Manual
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TABLE
OF
CONTENTS
TITLE
PAGE
INTRODUCTION
2
SYSTEM
BLOCK
DIAGRAM
2
THE
MEMORY
MAP
4
THEORY
OF
OPERATION
5
WAIT,
INT*,
TEST
6
CPU
Address
Lines
6
CPU
Data
Bus
6
CPU
Control
Group
7
Control
Group
Bus
7
Address
Decoder
8
System
RAM
11
Video
Divider
Chain
13
Video
RAM
Addressing
16
Alphanumeric
Format
16
Video
Processing
17
Keyboard
23
Input
and
Output
Port
23
Cassette
Motor
Control
23
Cassette
Audio
Output
24
Cassette
Audio
Input
25
INSIG*
26
System
Power
Supply
27
Level
II
ROM's
28
PARTS
LIST
30
SCHEMATICS
34
2
4
Table of Contents
Table of Contents
3
Introduction
4
System Block Diagram
4
The Memory Map
6
Theory of Operation
7
Wait, Int*, Test
8
CPU Address Lines
8
CPU Data Bus
8
CPU Control Group
9
Control Group Bus
9
Address Decoder
10
Ram
13
Video Divider Chain
15
Video
18
RAM Addressing
18
Alphanumeric Format
18
Video Processing
19
Keyboard
25
Input and Output Port
25
Cassette Motor Control
25
Cassette Audio Output
26
Cassette Audio Input
27
Insig
28
System Power Supply
29
Level
30
Roms
30
Parts List
32
Schematics
36
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Radio Shack CCR-81 Specifications
General
Brand
Radio Shack
Model
CCR-81
Category
Desktop
Language
English
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