Int 21 Fn 35  - Dos 2+ - Get Interrupt Vector                              [D]

   AH = 35h
   AL = interrupt number

Return: ES:BX -> current interrupt handler

Note:  under DR DOS 5.0+, this function does not use any of the DOS-internal
     stacks and may thus be called at any time

See Also: AH=25h,AX=2503h