X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 10 - video - graphics-mode character generator functions (ps, ega, vga)

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INT 10 - VIDEO - GRAPHICS-MODE CHARACTER GENERATOR FUNCTIONS (PS, EGA, VGA)
        AH = 11h
        AL = 20h: set user 8 by 8 graphics characters (INT 1Fh)
            ES:BP -> user table
        AL = 21h: set user graphics characters
            ES:BP -> user table
            CX    = bytes per character
            BL    = row specifier
                   00h user set
                      DL = number of rows
                   01h 14 rows
                   02h 25 rows
                   03h 43 rows
        AL = 22h: ROM 8 by 14 set
            BL = row specifier
        AL = 23h: ROM 8 by 8 double dot
            BL = row specifier
        AL = 24h: load 8x16 graphics characters (VGA/MCGA)
            BL = row specifier
        AL = 29h: load 8x16 graphics characters (Compaq Systempro)
            BL = row specifier
Note:   these functions are meant to be called only after a mode set

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