Get Real Mode Interrupt Vector


                 This function  returns the  value of the current task's
                 real mode interrupt vector for the specified interrupt.

            To Call

                 AX = 0200h
                 BL = Interrupt number

            Returns

                 Carry flag is clear.
                 CX:DX = Segment:Offset of real mode interrupt handler

            Programmer's Notes

                 o    The address  returned in  CX is  a segment,  not a
                      selector.   Therefore you  should not  attempt  to
                      place the  value returned  in CX  into  a  segment
                      register in protected mode or a general protection
                      fault may occur.
                 o    Note all 100h (256 decimal) interrupt vectors must
                      be supported by the DPMI host.