Int 10 Fn 1121  - Video - Graph-mode Chargen - Set User Graphics Characte  [V]

   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

See Also: AX=1120h,AX=1122h,AX=1123h,AX=1124h,AX=1129h,INT 1F,INT 43