Constants Used as Parameters to TextMode (Crt unit)

 Constant   Value   Mode               Adapter
 BW40         0     40x25 B/W          CGA
 CO40         1     40x25 Color        CGA
 BW80         2     80x25 B/W          CGA
 CO80         3     80x25 Color        CGA
 Mono         7     80x25 B/W on MDA   HGC
 Font8x8     256    43-/50-line mode   EGA/VGA

 Mode constants for 3.0 compatibility
      C40  = CO40;
      C80  = CO80;

 BW40, CO40, BW80, and CO80 represent the four color text modes supported by
 the IBM PC Color/Graphics Adapter (CGA).

 Mono represents the single black-and-white text mode supported by the IBM
 PC Monochrome Adapter.

 After you use graphics, LastMode returns to the last active text mode.

 CRT.TPU