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           Hercules, Olivetti, or AT&T Adapters
SCREEN 3: Hercules adapter required, monochrome monitor only
    ■ 720 x 348 graphics
    ■ 80 x 25 text format, 9 x 14 character box
    ■ 2 screen pages (or one, if a second display adapter is installed)
    ■ PALETTE statement not supported
SCREEN 4:
    ■ Supports Olivetti (R) Personal Computers models M24, M240, M28,
      M280, M380, M380/C, M380/T, and AT&T (R) Personal Computers 6300
      series
    ■ 640 x 400 graphics
    ■ 80 x 25 text format, 8 x 16 character box
    ■ 1 of 16 colors assigned as the foreground color (selected by the
      COLOR statement); background is fixed at black.