Tandy 1000 Technical Reference Manual

IBM PC
IBM PCjr TANDY l~~~
~ 3
F
~
FDC, DOR REGISTER (WRITE ONLY)
DOR REGISTER
I
I
2
~
3 DOR REGISTER (WRITE ONLY) DOR REGISTER (WRITE ONLY)
4 - STATUS (READ ONLY) FDC - STATUS (READ ONLY)
5 FDC - DATA (R/W)
I
- DATA (R(W)
6
~
- STATUS (READ)
7
FDC - DATA (R/W)
8
9
A
B
C
D
E
~
3 F F
FDC FUNCTION SELECT IS FROM
IBM PCjr FDC @ ~~FX Al =X
A3 - A9. FDC A~ = A~, FDC CSV = Al
DOR A2 = ~
SELECT FOR 'DOR' IS FDC
FDC A2 = I
FUNCTIONAL
SELECT· A2
IBM SPECIFIES
FDC - STATUS -
3F4
FDC -DATA - 3F5
DOR- 3F2
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