Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 10h Function 12h Subfunction 30h
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  Interrupt:   10h     Function:   12h     Subfunction:   30h
 
  Title:       Set Scan Lines
 
  See also:    Set Video Mode
 
  Description:                                                     [VGA]
 
     Selects the number of scan lines for alphanumeric modes. The
     selected value takes effect the next time Int 10h Function 00h
     is called to select the display mode.
 
     Input                         Output
 
     AH = 12h                      If the VGA is active
     AL = Scan line code             AL = 12h
          00h = 200 scan lines
          01h = 350 scan lines     If the VGA is not active
          02h = 400 scan lines       AL = 00h
          03h = 480 scan lines
     BL = 30h
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