Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
256K Memory Expansion Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 73
Jumper Options 73
Theory
of Operation " 74
RS-232 Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 77
Introduction " 77
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 78
300 Baud Modem 85
Introduction 85
Theory
of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 86
Mouse Clock/Calendar Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 91
Introduction " 91
Theory of Operation Hardware . . . . . . . . . . . . . . .. 91
Theory of Operation Software . . . . . . . . . . . . . . . . . . .. 92
Keyboard Assembly
101
Keyboard Specifications 101
Key Code Chart 102
Keyboard Timing 104
Keyboard Layout 105
Appendices
AI Comparative Tables for IBM
PC and PCjr Computers
BI Printer Specifications
CI Intel Corporation Specifications:
8088-2 8237A-5
8253-5 8255A-5
8259A-8 8272A .
8284A-1
01 Texas Instruments Specifications:
76496
EI Motorola Semiconductors Specifications:
MC6845
FI Teac Disk Drive Manual
GI Connectors and Pin Designations
HI Schematics

Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200