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Int 10 Fn 12 - Video - Alternate Function Select (ps,ega,vga,mcga) - Alt [V]
AH = 12h
BL = 20h select alternate print screen routine
Desc: 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
Note: some adapters disable print-screen instead of enhancing it
See Also: INT 05
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