Compatibility: EGA VGA
Expects: AX    1110H
BH    height of each character (bytes per character definition)
BL    font block to load (EGA: 0-3; VGA: 0-7)
CX    number of characters to redefine
DX    ASCII code of the first character defined at ES:BP
ES:BP address of font-definition information
                                                                  
Returns: (none)
                                                                  
Info: Redefines one or more characters on EGA/VGA cards, exactly as
described for INT 10H 1100H, except that it takes the additional
steps needed to activate the font.

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INT 10H 1110H: Load and Activate User-Defined Font