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        Indirect function call (INT 21h, 5D00h)

        Entry:
          DS:DX points to buffer containing register values
                     AX, BX, CX, DX, SI, DI, DS, ES
                for a call to INT 21h
        Return as appropriate for function being called

        Note: This function does not check value in AH. Out of
              range values will crash the system