Tandy 1000 Technical Reference Manual

IBM PC
IBM PCjr
TANDY 1~~~
~ ~ ~ ~
8237A-S DMA CONTROLLER
8237 A-S DMA CONTROLLER
I
2
3
4
S
6
7
(32 PORTS THRU ~~IF)
8
9
A
B
C
D
E
~
~ ~ F
8237A-S
DMA CONTROLLER
8237 A-S DMA CONTROLLER
AI~ - AIS NOT DECODED
NO DMA FUNCTION AVAlLABLE.
CHIP SELECT FROM
A4 - AIS
CHIP SELECT FROM AS - A9
A~. AI, A2, A3 TO IC
A~, AI, A2, A3 TO IC
ASSIGNED ADDRESS:
~~~~ - ~~~F
A4=X
DMA FUNCTION OPTIONAL.
ADDRESS RANGE:
~~~~ - ~~IF
ASSIGNED ADDRESS: ~~~~ - ~~~F.
o
o
o

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