INT 21 - Phar Lap 386/DOS-Extender - GET REAL-MODE INTERRUPT VECTOR
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
SeeAlso: AX=2504h,AH=35h,INT 31/AX=0200h

See also: 212502

212503 - Phar Lap 386/DOS-Extender - GET REAL-MODE INTERRUPT VECTOR