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.

Esc or Alt-X to exit int 21,f8 Home/PgUp/PgDn/End ←↑↓→