Function            CompaqSetMasterMode - Set master mode of current
                                              controller

  Syntax              void CompaqSetMasterMode(unsigned char mastermode);

  Prototype in        video.h

  Remarks             CompaqSetMasterMode() sets the master mode of the
                      current controller on a Compaq Portable, based on
                      the value of the parameter mastermode:

                           0x04 - CGA
                           0x05 - EGA
                           0x07 - MDA

  Return value        nothing.

  Note                This function should ONLY be used on a Compaq
                      Portable or unpredictable results may occur.

  See also            CompaqExternalMonitorType(), CompaqGetMonitor(),
                      CompaqGetMasterMode(), CompaqInternalMonitorType(),
                      CompaqModeSwitchDelay(), CompaqSelectMonitor()