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Tandy 1000 HX - Equipment; Memory Size

Tandy 1000 HX
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Equipment
This service returns
the
"equipment flag" (hardware configura-
tion
of
the computer system)
in the AX
register.
Software Interrupts:
11
hex (17 dec)
The "equipment flag" returned
in the AX
register
has the
mean-
ings listed below
for
each
bit:
Reset
= the
indicated equipment
is not in the
system
Set
= the
indicated equipment
is in the
system
bit
0
diskette installed
bit
1
math coprocessor
bit
2,3
always
= 11
bit
4,5
initial video mode
01
=
40x25
BW
10
=
80x25
BW
bit
6,7
number
of
diskette drives (only
if
bit
0 = 1)
00
= 1
01
= 2
bit
8 0 = dma
present
1
= no dma on
system
bit
9, 10, 11
number
of
RS
232
cards
bit
12
game
I/O
attached
bit
13 not
used
bit
14, 15
number
of
printers
Memory Size
This service returns
the
total number
of
kilobytes
of
RAM
in the
computer system (contiguous starting from address
0) in the AX
register.
The
maximum value returned
is 640.
Software Interrupts:
12
hex (18 dec)
22

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