Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 12h Subfunction 20h
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  Interrupt:   10h     Function:   12h     Subfunction:   20h
 
  Title:       Select Alternate PrintScreen
 
  See also:    Print Screen
 
  Description:                                               [EGA] [VGA]
 
     Selects an alternate print-screen routine for the EGA and VGA that
     works properly if the screen length is not 25 lines. The ROM BIOS
     default print-screen routine always prints 25 lines.
 
     Input        Output
 
     AH = 12h     None
     BL = 20h
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