Commodore Amiga A500 - Page 161

PC JANUS SERVICE
This service is called via INT JANUS.
AH contains a function code
J-GET-SERVICE
Gets a new Service Number
Expects:
nothing
Returns:
AL
: New Service Number to use
- 1 if no service available (J-NOSERVICE)
J-GET-BASE
Gets Segments €4 offset of Janus Memory
Expects:
AL Janus Service Number
Returns:
ES
: Janus Parameter Segment
DI : Janus Parameter Offset (if defined),
else
- 1
DX : Janus Buffer Segment
AL
: Status (J-OK, J-NO-SERVICE)
JALLOC-MEM
Allocates Janus Memory
Expects:
AL
: Type of memory to allocate
BX : Number of Bytes to allocate
Returns:
BX : Offset of registered memory if success,
AL
: Status (J-OK. J-NO-MEMORY)
J-FREEMEM
Releases Janus Memory
Expects:
AL Type of memory to free
BX Offset of Memory to free
Returns:
Crash if
offsethype was wrong (J-GOODBYE, later)
Set the default parameter memory pointer
Expects:
AL
: Janus Service Number to support
BX
: Default Offset of Param Memory to install
Returns:
AL
: Status (J-OK, J-NOSERVICE)