X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 10 - video

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INT 10 - VIDEO - GET CURRENT VIDEO MODE
        AH = 0Fh
Return: AH = number of columns on screen
        AL = current video mode (see INT 10/AH=00h)
        BH = current active display page
Note:   if mode was set with bit 7 set ("no blanking"), the returned mode will
          also have bit 7 set
SeeAlso: AH=00h,05h

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