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Tandy 1000 Programmer's Reference Guide

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Appendix
C
I
MS-DOS
Memory Map
19
1
byte
-
used
to
store ALT keypad
1A
1c
1E 16
-
keyboard buffer (enough for
entry
keyboard buffer
keyboard buffer
words)
1
word
-
pointer
to
beginning
of
the
1
word
-
pointer
to
end of the
15
-
typeahead entries
The structure and usage of the clock service routine is as
follows:
HEX
Offset
From
Length and
Segment
00400000
Intended Use
6CH
6EH
70H
1
byte
-
Twenty four hour rollover
1
word
-
Lease significant 16 bits of
1
word
-
Most significant 16 bits of
clock count
clock count
flag
233

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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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