Tandy 1000 Technical Reference Manual

IBM PC IBM PCjr
TANDY l~~~
DATA
3F2 (WRITE ONLY)
SAME
SAME
BIT
~
DRIVE SELECT ~*
DRIVE ENABLE
DRIVE SELECT
~*
BIT 1 DRIVE SELECT 1*
NOT USED DRIVE SELECT 1*
BIT2
~ = FDC RESET
NOT USED
~ =FDC RESET
BIT 3
1
=ENABLE INTERRUPT, DMA NOT USED
1
=ENABLE DMA REQ/INTERRUPT
BIT 4 1 = DRIVE MOTOR # 1 ON
NOT USED
1
= DRIVE ~ MOTOR ON
BIT 5
I
#2 I
WATCH DOG TIMER ENABLE
1
= DRIVE 1 MOTOR ON
BIT 6
~
#3 !
WATCH DOG TIMER TRIGGER
1 - FDC TERMINAL COUNT
BIT 7
1
= DRIVE MOTOR #4 ON
FDC RESET
NOT USED
* TO SELECT DRIVE~: BIT ~* .BIT 1*
TO SELECT DRIVE 1: BIT ~ . BIT 1*
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