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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.
 
     Subfunction 11h acts like Subfunction 01h, but it also adjusts
     character height according to the height of characters being
     loaded.
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