Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 12h Subfunction 34h
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  Interrupt:   10h     Function:   12h     Subfunction:  34h
 
  Title:       Enable/Disable Cursor Emulation
 
  See also:    Set Cursor Type
 
  Description:                                                     [VGA]
 
     Enables or disables cursor emulation for the currently active
     display. When cursor emulation is enabled, the ROM BIOS
     automatically remaps Int 10h Function 01h cursor starting and
     ending lines for the current character cell dimensions.
 
     Input                                    Output
 
     AH = 12h                                 If function supported
     AL = 00h to enable cursor emulation        AL = 12h
        = 01h to disable cursor emulation
     BL = 34h
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