Int 15 Fn C5  UC - OS Hook - ROM BIOS Tracing Callout (ps30/286,ps50z,ps9  [B]

   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