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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.
 
     Subfunction 12h acts like Subfunction 02h, but it also adjusts
     character height according to the height of characters being
     loaded.
                                    -♦-