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    This function provides font selection in text (alphanumeric) display
    mode.   For font selection in graphics (all-points-addressable) modes,
    see Int 10H Function 11H Subfunctions 20H-24H.
 
    If AL =14H, page 0 must be active. The points (bytes per character),
    rows, and length of the refresh buffer are recalculated.
    The controller is reprogrammed with the maximum scan line (points -1),
    cursor start (points -2), cursor end (points -1), vertical display end
    rows * points -1 for 350 and 400 line modes, or rows * points * 2 -1 for
    200 line modes), and underline location (points -1, mode 7 only).
 
      If Subfunction 14H is called at any time other than immediately after a
      mode set, the results are unpredictable.
 
    On the MCGA, a Subfunction 04H call should be followed by a
    Subfunction 03H call so that the ROM BIOS will load the font into the
    character generator's internal font pages.
 
    Subfunction 14H is reserved on the MCGA. If it is called, Subfunction
    04H is executed.
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