Tandy 1000 Technical Reference Manual

IBM PC IBM PCjr
TANDY 1000
DATA
~~A~ - WRITE
~~M- ~A7 ~~A~, ~~AI
BIT~
X
X
MEMCONFIG~
BIT 1
I
MEMCONFIG 1
BIT 2
~
MEMCONFIG 2
BIT 3 X MEMCONFIG 3
BIT 4
1 =DISABLE - HRQ (BUS HOLD REQ) X
BIT 5
J: TIMER CLK #2 = 1.1925 MHZ
X
: TIMER CLK #2 =CLK #1 OUT
BIT 6 X 1 = IR TEST
X
BIT 7 1 = ENABLE NMI 1 =ENABLE NMI
1 =ENABLE NMI
READ FROM ~C/JAC/J - NO FUNCTION.
READ FROM ~~A~ - ~~A 7
READ FROM ~~A~, ~~A1
CLEARS NMI ENABLE HAS NO FUNCTION.
NO DATA INVOLVED. DEFINES ONE OF FIVE
128K MEMORY.
SEE MEMORY PAGE MAP.
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