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INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS,EGA,VGA,MCGA) - ALTERNATE PRTSC
        AH = 12h
        BL = 20h  select alternate print screen routine
Notes:  installs a PrtSc routine from the video card's BIOS to replace the
          default PrtSc handler from the ROM BIOS, which usually does not
          understand screen heights other than 25 lines
        some adapters disable print-screen instead of enhancing it

See Also: 05
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