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Tandy 1000 Technical Reference Manual

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PC
MEMORY
MAP
PCjr
MEMORY
MAP
TANDY
1
~~~
MEMORY
MAP
~3D~
~3DI
~3D2
~3D3
~3D4
6845
ADDRESS
REGISTER
6845
ADDRESS
REGISTER
6845
ADDRESS
REGISTER
~3D5
6845 DATA
REGISTER
6845
DATA
REGISTER
6845
DATA REGISTER
~3D6
~3D7
~BD8
MODE SELECT
REGISTER
NOT AVAILABLE
MODE SELECT REGISTER
~3D9
COLOR SELECT
REGISTER
NOT
AVAILABLE
COLOR SELECT
REGISTER
~3DA
READ STATUS
REGISTER
WRITE GATE
ARRAY
ADDRESS, DATA
WRITE VIDEO ARRAY ADDRESS
& READ STATUS
& READ STATUS
~3DB
CLEAR
LIGHT PEN LATCH
CLEAR LIGHT PEN LATCH
CLEAR LIGHT PEN LATCH
~3DC
PRESET LIGHT PEN LATCH PRESET LIGHT PEN LATCH
PRESET LIGHT PEN LATCH
~3DD
~3DE
WRITE VIDEO
ARRAY
DATA
~3DF
CRT PROCESSOR PAGE
REGISTER
CRT PROCESSOR PAGE
REGISTER
SYSTEM MEMORY READ = 1 WAIT
RAM READ/WRITE
~ 6 WAITS
RAM READ/WRITE
~ 2 WAITS
TIMING
I/O
READ/WRITE =1 WAIT
ROM READ
=
~
WAITS
ROM READ
=0 WAITS
I/O
READ/WRITE =0 WAITS
I/O
READ/WRITE = 1 WAlTS
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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