Int 7E Fn 00FF  - Sbos V3.82 - Set Interrupt For ???                       [s]

   AX = 00FFh
   BL = new interrupt vector to hook

Return: BX = 03CDh if supported
Desc:  unhooks the current interrupt handler for ???, and reconnects it to the
     specified new interrupt number

See Also: AX=00F7h,AX=00F9h,AX=00FEh