INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET USER GRAPHICS CHARACTERS (PS,EGA,VGA)
        AX = 1121h
        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
Note:   this function is meant to be called immediately after a mode set;
          results are unpredictable at other times
SeeAlso: AX=1120h,AX=1122h,AX=1123h,AX=1124h,AX=1129h,INT 1F,INT 43

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