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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=11H, 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 11H is called at any time other than immediately
    after a mode set, the results are unpredictable.
 
    Subfunctions 01H and 11H are reserved on the MCGA. If either is called,
    Subfunction 04H is executed.
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