TRS-80 Microcomputer Technical Reference Handbook
first edition, first print
In English
Radio Shack catalog no. 26-2103
Publisher:
Radio Shack
1978
Table of Contents
Introduction
7
System Block Diagram Description
9
The Memory Map
12
THEORY OF OPERATION
14
CPU Address Lines
16
CPU Data Bus
17
CPU Control Group
18
System RAM
24
Video Divider Chain
28
Video RAMs
34
Video Processing
34
Keyboard
44
Input and Ouput Port
44
System Power Supply
52
Level II ROMs
55
ADJUSTEMENTS AND TROUBLESHOOTING
57
THE OUTSIDE WORLD
83
Memory mapped External Device
86
Port Based External Device
88
Explanation of Expansion Port Signals
90
Pin COnnections for Expansion Port Edge Card
91
PARTS LIST
93
SCHEMATIC
99
BASIC I ROMs
100
BASIC II ROMs
104
TSR-80 Master Schematic
107
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Last updated Jan 07, 2006