Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 12h Subfunction 36h
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  Interrupt:   10h     Function:   12h     Subfunction:   36h
 
  Title:       Enable/Disable Screen Refresh
 
  Description:                                                     [VGA]
 
     Enables or disables the video refresh for the currently active
     display.
 
     Input                           Output
 
     AH = 12h                        If function supported
     AL = 00h to enable refresh        AL = 12h
        = 01h to disable refresh
     BL = 36h
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