Compatibility: All
Expects: AH    0fH
                                                                  
Returns: AL    current video mode
AH    width of screen, in character columns
BH    current active video page (0-based)
                                                                  
Info: This obtains a certain data regarding the current video mode.

Use INT 10H 12H (special fns) and
see EGA/VGA Data Areas to get info on EGA modes.

Use  INT 10H 1bH (get functionality/state info) for VGA modes.

Use INT 10H 4f03H (get SVGA info) to get info on VESA modes

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INT 10H 0fH: Query Current Video Info