INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET PROTECTED-MODE INTERRUPT VECTOR
        AX = FB42h
        BX = 0024h
        CL = interrupt number
Return: DX = status (0000h) (see also AX=FB42h/BX=0004h)
        AX:BX = selector:offset of handler
SeeAlso: INT 31/AX=0204h