bas7advr.hlp (Topic list)
SCREEN Modes 1 and 2
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                CGA, EGA, VGA, or MCGA Adapters
SCREEN 1: 320 x 200 graphics
    ■ 40 x 25 text format, 8 x 8 character box
    ■ 16 background colors and one of two sets of 3 foreground colors
      assigned using COLOR statement with CGA
    ■ 16 colors assigned to four color attributes with EGA, VGA, or MCGA
SCREEN 2: 640 x 200 graphics
    ■ 80 x 25 text format with character box size of 8 x 8
    ■ 2 colors (black and white) with CGA
    ■ 16 colors assigned to two color attributes with EGA or VGA