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Tandy 1000 Technical Reference Manual

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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

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Tandy 1000 Specifications

General IconGeneral
ProcessorIntel 8088
Processor Speed4.77 MHz
RAM128 KB (expandable to 640 KB)
Operating SystemMS-DOS 2.11
ManufacturerTandy Corporation
Release Year1984
StorageSingle or double 5.25" floppy disk drive (360 KB), optional hard drive
SoundTandy 3-voice sound
PortsParallel, Serial
GraphicsCGA (Color Graphics Adapter)
Graphics Modes320x200, 640x200

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