Other Adapter Boards
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 (1 only 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.