Tandy 1000 Technical Reference Manual

VIDEO ARRAY
PC MEMORY MAP PCjr MEMORY MAP TANDY 1 ~0~ MEMORY MAP
ADDRESS
3DA
GATE ARRAY 3DA VIDEO ARRAY 3DA & 3DE
(3DA)
READ WRITE
READ WRITE READ (3DA)
WRlTE(3DE)
1'9 BIT I'
OISPLAY INACTIVE Jl{OTUSED
OISPLAY ENABLE HIBW/LOBW
OISPLAY INACTIVE NOT USED
l'\t BIT I
LIGHT PEN SET
NOT USED
LIGHT PEN SET GRAPHICS
LIGHT PEN SET NOT USED
H BIT 2
LIGHT SWITCH STATUS NOT USED
LIGHT SWITCH STATUS
B/W
LIGHT SWITCH STATUS
NOT USED
l'\tBIT3
VERTICAL RETRACE
NOT USED
VERTICAL RETRACE VIDEO ENABLE
VERTICAL RETRACE
NOT USED
HBIT4
NOT USED
NOT USED
VIDEO DOTS
16 COLOR GRAPHICS NOT USED
NOT USED
In BIT I'
NOT USED PALETTE MASK I'
PALETTE MASK I'
1'1 BIT I
NOT USED PALETTE MASK I
PALETTE MASK I
1'1 BIT2
NOT USED PALETTE MASK 2
PALETTE MASK 2
IH BIT3
NOT USED PALETTE MASK 3
PALETTE MASK 3
1'2 BIT I'
NOT USED BORDER BLUE
BORDER BLUE
1'2 BIT I
NOT USED
BORDER GREEN
BORDER GREEN
In BIT 2
NOT USED
BORDER RED
BORDER RED
1'2 BIT 3
NOT USED BORDER INTENSITY
BORDER INTENSITY
1'3 BIT I'
NOT USED
RESERVED
=1'
NOT USED
1'3 BIT I
NOT USED
ENABLE BLINK
NOT USED
1'3 BIT 2
NOT USED
RESERVED
=\t
BORDER ENABLE
1'3 BIT 3
NOT USED
2 COLOR GRAPHICS
4 COLOR HIGH RES.
1'3 BIT 4
NOT USED
NOT USED
16 COLOR MODE
1'4 BIT I'
NOT USED
ASYNCHRON. RESET
NOT USED
1'4 BIT I
NOT USED SYNCHRONOUS RESET NOT USED
II' - IF BIT I'
NOT USED
PALETTE BLUE
PALETTE BLUE
II' - IF BIT I
NOT USED PALETTE GREEN PALETTE GREEN
II' - IF BIT 2
NOT USED
PALETTE RED PALETTE RED
II'-IFBIT3
NOT USED
PALETTE INTENSITY
PALETTE INTENSITY
READS STATUS
READS STATUS
WRITE ADDRESS
READS STATUS
WRITE ADDRESS
AT3DA
AT 3DA AND
AT3DA
AT3DA AT3DA
SET ADDRESS/DATA
WRITE DATA
WRITE DATA
FLIP·FLOP
TO ADDRESS
AT3DA AT3DE
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