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    This function provides font selection in text (alphanumeric) display
    modes. For font selection in graphics (all-points-addressable) modes,
    see Int 10H Function 11H Subfunctions 20H-24H.
 
    If AL =12H, 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), and underline location (points -1, mode 7 only).
 
    If Subfunction 12H is called at any time other than immediately after
    a mode set, the results are unpredictable.
 
    On the MCGA, a Subfunction 02H 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 12H is reserved on the MCGA. If it is called, Subfunction 02H
    is executed.
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