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  Description:  Set Scan Lines      [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            If the VGA is not active
     01H=350 scan lines            AL=00H
  BL=30H
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