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AH = C5h AL = interrupt being invoked 01h INT 19 02h INT 14 03h INT 16 04h INT 40 (floppy INT 13) 05h INT 17 06h INT 10 07h INT 12 08h INT 11 09h INT 1A
Return:
All registers except AX must be preserved
Notes: Called as the very first action of the indicated ROM BIOS interrupt handlers on the PS/2 Models 30/286, 50Z, and 95. Default handler does nothing and returns CF clear for the above subfunctions, CF set and AH=86h for all other subfunctions. Value of AX passed to the original interrupt handler is pushed on stack immediately prior to call
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