Int 31 Fn 0200 P - Dpmi 0.9+ - Get Real Mode Interrupt Vector [E]
AX = 0200h
BL = interrupt number
Return: CF clear
CX:DX = segment:offset of real mode interrupt handler
Note: the DPMI implementation is required to support all 256 vectors
See Also: AX=0201h,AX=0204h,INT 21/AX=2503h