bas7advr.hlp (Topic list)
SCREEN Mode 10, Monochrome Monitor Only
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     EGA or VGA Adapters, Monochrome Monitor Only
SCREEN 10: 640 x 350 graphics, monochrome monitor only
    ■ 80 x 25 or 80 x 43 text format, 8 x 14 or 8 x 8 character box size
    ■ 128K page size, page 0 (128K adapter memory) or 0-1 (256K)
    ■ Up to 9 shades of gray assigned to four color attributes