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  Description:  Set Int 43H for User's Font      [EGA] [MCGA] [VGA]
 
  Sets the vector for Int 43H to point to the user's font table and updates
  the video ROM BIOS data area. The video controller is not reprogrammed.
 
  Input                                           Output
  ══════════════════════════════════════════      ═══════
  AH=11H                                          Nothing
  AL=21H
  BL=character rows specifier
     00H if user specified (see register DL)
     01H =14 (0EH) rows
     02H =25 (19H) rows
     03H =43 (2BH) rows
  CX=points (bytes per character)
  DL=character rows per screen (if BL =00H)
  ES:BP=segment:offset of user font table
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