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  CONST
      { display modes }
      BW40    = 0;      { 40 x 25, Color Adapter, B/W   }
      CO40    = 1;      { 40 x 25, Color Adapter, Color }
      BW80    = 2;      { 80 x 25, Color Adapter, B/W   }
      CO80    = 3;      { 80 x 25, Color Adapter, Color }
      Mono    = 7;      { 80 x 25, Monochrome Adapter   }
 
      Font8x8 = 256;    { 43- or 50-line display mode   }
 
      { alternate display mode constants }
      C40     = CO40;
      C80     = CO80;
 
  Unit:     Crt
 
  Context:  TextMode
 
  Description
 
    The constants BW40, CO40, BW80, and CO80 set modes for CGA/EGA/VGA
    color displays. The Mono constant sets monochrome display mode for
    MDA or Hercules. This mode can also be used on an EGA or VGA, if a
    monochrome monitor is present.
 
    Add the Font8x8 constant to CO80 to switch away from 25-line mode.
    The setting causes an EGA to display text in 43-line mode, and a
    VGA to display text in 50-line mode.