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Front page

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
Introduction7
System Block Diagram Description9
The Memory Map12
THEORY OF OPERATION14
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 TROUBLESHOOTING57
THE OUTSIDE WORLD83
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 LIST93
SCHEMATIC99
BASIC I ROMs
100
BASIC II ROMs
104
TSR-80 Master Schematic
107



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This page has been created by Sami Rautiainen.
Read the small print. Last updated Jan 07, 2006