Int 21 Fn 2504  P - Phar Lap 386/dos-extender - Set Protected-mode Interr  [E]

   AX = 2504h
   CL = interrupt number
   DS:EDX = CS:EIP of protected-mode interrupt handler

Return: CF clear

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

See Also: AX=2502h,AX=2505h,INT 31/AX=0205h