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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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 Screen Modes 3 and 4
 
 ■ Applies to Hercules, Olivetti, or AT&T adapters
 
 ■ Mode 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
 
   Note: In order to use graphics on a Hercules card, you must load the file
   MSHERC.COM before running your program from Visual Basic. Although
   MSHERC.COM from earlier versions of Microsoft Basic loads without an
   error on CGA systems, screen mode 3 graphics are not enabled.
 
 ■ Mode 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
 
 See: ◄SCREEN Statement►