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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=10H, 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 10H is called at any time other than immediately
    after a mode set, the results are unpredictable.
 
    On the MCGA, a Subfunction 00H call should be followed by a Subfunction
    03H call so that the ROM BIOS will load the font into the character gen-
    erator's internal font pages.
 
    Subfunction 10H is reserved on the MCGA. If it is called, Subfunction
    00H is executed.
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