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  Description:  Get Video Mode      [MDA] [CGA] [PCjr]
                                    [EGA] [MCGA] [VGA]
 
  Obtains the current display mode of the active video controller.
 
  Input             Output
  ══════            ══════════════════════════════════════════
  AH=0FH            AH=number of character columns on screen
                    AL=display mode (see Int 10H Function 00H)
                    BH=active display page
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