Online HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens
INT 21,F8 - Set OEM Int 21 Handler (functions F9-FF, Undocumented)
AH = F8
DS:DX = pointer to OEM handler for INT 21H calls F9 through FF
= FFFF:FFFF to reset to original handlers
- DOS is set up to allow ONE handler for all 7 function calls.
Any call to these handlers will set the CF and AX
will contain 1 if they are not initialized. The handling
routine is passed all registers just as the user set them.
The handler should exit with an IRET.
[helppc.bosbyte.nl] int 21,f8