Tandy 1000 Technical Reference Manual

IBM PC
IBM PCjr
TANDY l~~~
DATA
0378 (037C) RW
0378 (037C) 0378
BIT~
DATA BIT ~ - LSB DATA BIT ~ - LSB
DATA BIT
~ - LSB
BIT I
DATA BIT
1-
DATA BIT 1-
DATA BIT 1-
BIT 2
DATA BIT
2-
DATA BIT 2-
DATA BIT 2-
BIT 3
DATA BIT
3-
DATA BIT 3-
DATA BIT 3-
BIT 4
DATA BIT
4-
DATA BIT 4-
DATA BIT 4-
BIT 5
DATA BIT
5-
DATA BIT 5-
DATA BIT 5-
BIT 6
DATA BIT
6-
DATA BIT 6-
DATA BIT 6-
BIT 7
DATA BIT 7 -
MSB
DATA BIT 7 - MSB
DATA BIT 7 - MSB
0379 (037D) READ ONLY
0379 (037D) READ ONLY
0379
BIT ~
UNUSED
UNUSED
UNUSED
BIT 1
UNUSED UNUSED
UNUSED
BIT 2
UNUSED UNUSED
UNUSED
BIT 3
~ = ERROR CONDITION ~ = ERROR
~ = ERROR
BIT 4
1
= PRINTER SELECTED
1
= PRINTER SELECTED I = PRINTER SELECTED
BIT 5
~ = END OF FORM ~ = END OF FORM
~ = END OF FORM
BIT 6
~ = ACKNOWLEDGE
~ = ACKNOWLEDGE ~ = ACKNOWLEDGE
BIT 7
~= BUSY
~ = BUSY ~ = BUSY
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