INT 10H 4f03H - Query Current SuperVGA Video Mode

 Expects: AX    4f03H
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 Returns: AX    VESA status: AH=0 means successful (else failed)
                             AL=4fH means function supported
          BX    VESA/SVGA Video Mode number currently active
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    Info: Obtains the number of the current video mode.

   Notes: ■ Unlike INT 10H 0fH, this does NOT return the state of "clear
            video memory bit" that was used when the mode was initialized;
            that is, only the high bit of BX always comes back as 0.

See Also: SVGA
          VESA/SVGA BIOS Services
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