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CCR-81
Radio Shack CCR-81 Reference Handbook
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12V
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1---4
TAPE
INTERFACE
IN
DATA
IN/OUT
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TAPE
RECORDER/
PLAYER
DATA
IN/OUT
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RAM
DATA
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KEYBOARD
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DATA
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RAM
VIDEO
PROCESSING
VIDEO
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TERMINAL
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ISTER
.OCK
VIDEO
DIVIDER
CHAIN
DOT
CLOCK
FIGURE
1.
TRS-SO
System
Block
Diagram
10
10
12
Table of Contents
Table of Contents
6
Introduction
8
System Block Diagram Description
10
The Memory Map
13
Theory of Operation
15
CPU Address Lines
17
CPU Data Bus
18
CPU Control Group
19
System RAM
25
Video Divider Chain
29
Video Rams
35
Video Processing
35
Keyboard
45
Input and Output Port
45
System Power Supply
53
Level II Roms
56
Adjustments and Troubleshooting
58
The Outside Wor Ld
84
Memory Mapped External Device
87
Port Based External Device
89
Explanation of Expansion Port Signals
91
Pin Connections for Expansion Port Edge Card
92
Parts List
94
Schematics
101
BASIC I Roms
101
BASIC II Roms
105
Master Schematic Diagram
112
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Radio Shack CCR-81 Specifications
General
Brand
Radio Shack
Model
CCR-81
Category
Desktop
Language
English
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