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  Interrupt:   10h     Function:   11h     Subfunction:   21h
 
  Title:       Set Int 43h for User's Font
 
  Description:                                        [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                                         None
     AL = 21h
     BL = Character rows specifier
          00h (if user-specified in 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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