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    MDPA, CGA, Hercules, Olivetti, EGA, VGA, or MCGA Adapters
SCREEN 0: Text mode only
    ■ Screen format (in characters)
      - 40 x 25, 40 x 43, 40 x 50, or 80 x 25
      - 80 x 43 (EGA or VGA)
      - 80 x 50 (VGA)
    ■ Character box size
      - 8 x 8 for CGA; 8 x 8 or 8 x 14 with EGA
      - 9 x 14 for Hercules; 8 x 16 for Olivetti
      - 8 x 14, 9 x 14, or 9 x 16 with VGA
    ■ 16 colors assigned to two color attributes
    ■ 16 colors assigned to any of 16 color attributes (with CGA or EGA)
    ■ 64 colors assigned to any of 16 color attributes (with EGA or VGA)