Tandy 1000 Technical Reference Manual

Tandy 1000
MEMORY MAP
Address
308 Bit 0
308 Bit 1
308 Bit 2
308 Bit 3
308 Bit 4
308 Bit 5
309 Bit 0
309 Bit 1
309 Bit 2
309 Bit 3
309 Bit 4
309 Bit 5
MEMORY MAP (3DF)
Bit
o
1
2
3
4
5
6
7
Address
03FO
03FO
03F1
03F2
03F3
03F4
03F5
03F6
03F7
03F8
03F9
03FA
03FB
03FC
03Fo
03FE
03FF
Technical Reference Manual
Description
High Resolution Clock
Graphics Select
Black
And White
Video Enable
640 Dot
Graphics
Blink Enable
Background Blue
Background Green
Background Red
Background Intensity
Foreground Intensity
Color Select
Description
CRT Page 0
CRT Page 1
CRT Page 2
Processor Page 1
Processor Page 2
Processor Page 3
Video Address
Mode 0
Video Address
Mode 1
Description
oOR Register
oOR Register
OOR Register
OOR Register
oOR Register (Write Only)
FOC - Status (Read Only)
FOC - Data (R/W)
FOC - Status (Read)
FoC - Data (R/W)
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
A1 = X
OOR A2
= 0
FOC A2
= 1
Detailed Memory Map--Continued
70

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