Tandy 600 Programmer's Reference Manual page 8

INT
43h
-
DB
Function
Call
AX
BX
CX
DX
XXXXXXXX
XXXXXXXX
XXXXXXXX
XXXXXXXX
SP:
BP:
SI:
Dl:
IP:
FLG
CS
DS
SS
ES
Entry:
AH
-
Function
Code
DS:DX
-
Parameter Block
Exit
AX
-
Return value or error
code
See
the section
on
DBMS
Function
Calls for
descriptions
of
the available functions
and
their
entry
and
exit
parameters.
3