INT 31 P - DPMI 0.9+ - GET PROTECTED MODE INTERRUPT VECTOR
        AX = 0204h
        BL = interrupt number
Return: CF clear
        CX:(E)DX = selector:offset of handler
Notes:  16-bit programs use CX:DX, 32-bit programs use CX:EDX
        DPMI implementations are required to support all 256 vectors
        not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0205h,INT 21/AX=2502h,INT 2F/AX=FB42h/BX=0024h