Int 31 Fn FF01  P - Causeway - "intxx" - Simulate Real-mode Interrupt      [E]

   AX = FF01h
   BL = interrupt number
   ES:(E)DI -> real-mode register list (see #2819 at AX=0300h)

Return: register list updated

Note:  CauseWay fills in the values for SS, SP, and FLAGS itself, and ignores
     the values specified for CS and IP

See Also: AX=0300h,AX=FF02h