Int 21 Fn 2503  P - Phar Lap 386/dos-extender - Get Real-mode Interrupt V  [E]

   AX = 2503h
   CL = interrupt number

Return: CF clear
   EBX = CS:IP of real-mode interrupt handler

Note:  this function is also supported by FlashTek X-32VM

See Also: AX=2502h,AX=2504h,AH=35h,INT 31/AX=0200h