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  CONST
      { _VideoConfig adapter values }
      _MDPA = $0001;    { Monochrome Display Printer Adapter (MDPA) }
      _CGA  = $0002;    { Color Graphics Adapter             (CGA)  }
      _EGA  = $0004;    { Enhanced Graphics Adapter          (EGA)  }
      _VGA  = $0008;    { Video Graphics Array               (VGA)  }
      _MCGA = $0010;    { MultiColor Graphics Array          (MCGA) }
      _HGC  = $0020;    { Hercules Graphics Card             (HGC)  }
      _OCGA = $0042;    { Olivetti Color Graphics Adapter    (OCGA) }
      _OEGA = $0044;    { Olivetti Enhanced Graphics Adapter (OEGA) }
      _OVGA = $0048;    { Olivetti Video Graphics Array      (OVGA) }
 
  Unit:     MSGraph
 
  Context:  _GetVideoConfig
 
  Description
 
    These constants can be used to determine the type of the active
    adapter by using either simple comparisons or the bitwise operator
    AND.