Function            CompaqGetMasterMode - Get master mode of current
                                              controller

  Syntax              unsigned char CompaqGetMasterMode(void);

  Prototype in        video.h

  Remarks             CompaqGetMasterMode() gets the master mode of the
                      current controller on a Compaq Portable.

  Return value        returns the master mode of the current controller
                      as follows:

                           0x00 - switchable VDU not present
                           0x04 - CGA
                           0x05 - EGA
                           0x07 - MDA

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

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