Tandy 600 Programmer's Reference Manual page 24

Bios programmers
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FUNCTION
25h
-
Set
Interrupt
Vector
AX:
BX;
CX:
DX:
XXXXXXXX
XXXXXXXX
XXXXXXXX
XXXXXXXX
SP:
BP:
SI:
Dl:
IP:
FLG
CS
DS
ss
ES
Entry;
AH =
25h
(function
code)
AL
=
Interrupt
number
DS:DX =
Address
of interrupt
Exit
None
XXXXXXXXXXXXXXXXXXX
Function
25h
is
used
to set
an
interrupt
vector
in
low
memory
to
point
to
an
interrupt
handler
routine.
19

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