INT 10 - VIDEO - Realtek RTVGA - SET USER 8x8 GRAPHICS CHARACTERS
        AX = 110Fh
        ES:BP -> user table for INT 1F
Note:   this function is meant to be called immediately after a mode set;
          results are unpredictable at other times
SeeAlso: AX=1110h,AX=1111h,AX=1112h,AX=1120h

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