VGA and MCGA Adapter SCREEN Modes
Screen 11
  - 640 x 480 graphics
  - 80 x 30 or 80 x 60 text format, character box size of 8 x 16 or 8 x 8
  - Assignment of up to 256K colors to 2 attributes
Screen 12
  - 640 x 480 graphics
  - 80 x 30 or 80 x 60 text format, character box size of 8 x 16 or 8 x 8
  - Assignment of up to 256K colors to 16 attributes
  - VGA required
Screen 13
  - 320 x 200 graphics
  - 40 x 25 text format, character box size of 8 x 8
  - Assignment of up to 256K colors to up to 256 attributes