Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
0060 - PORT A
Bit Description
o Keyboard Bit 0 - LSB
1 Keyboard Bit 1 -
2 Keyboard
Bit 2 -
3 Keyboard
Bit 3 -
4 Keyboard
Bit 4 -
5 Keyboard Bit 5 -
6 Keyboard
Bit 6 -
7 Keyboard Bit 7 -
MSB
See Keyboard Specifications
0061 - PORT B - READ OR WRITE
Bit Description
o 1 = 8253 Gate #2 Enabled
1 Speaker Data Out
2 Not used
3 Not used
4 Not Used
5 Sound Control 0
6 Sount Control 1
7 1
= Keyboard Clear
0062 - PORT C - READ/WRITEs
Bit
Description
0
(Out) Not Used
1
(Out) Multi-Data
2
(Out) Multi-Clock
3
(Out) Not Used
4 (In) Not Used
5
8253 Cut #
6
(In) Not Used
7
(In) Not Used
5. The hardware logic is configured so that Port C is split with an input at PC4 - PC? and an
output a~ pca - PC3.
Detailed Memory Map--Continued
62

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