Tandy 1000 Technical Reference Manual

Tandy 1000
037A (037E)
Bit
o
1
2
3
4
5
6
7
Address
300
301
302
303
304
305
306
307
308
309
30A
30B
30C
300
30E
30F
Technical Reference Manual
Description
o = Strobe
o = Auto FO XT
o = Initialize
o = Select Printer
1
= Enable Interrupt
o = Enable Output Data
Not used
Not used
Memory Map
Not used
Not used
Not used
Not used
6845 Address Register
6845 Data Register
Not used
Not used
Mode Select Register
Color Select Register
Write Video Array Address
& Read Status
Clear Light
Pen Latch
Preset Light
Pen Latch
Not used
Write Video Array Data
CRT Processor Page Register
Detailed Memory Map--Continued
68

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