Apple LaserWriter 12/640 PS - Manual (Page 162)

Features
Click the Features tab to display the Features tab dialog box, which lets you
configure the printer software to use optional printing features that you install
on the LaserWriter 12/640 PS. Use this dialog box to set up any optional
features you may purchase, such as additional memory or the 500-sheet
cassette and feeder.
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PhotoGrade Turns PhotoGrade on or off. To use PhotoGrade, your printer
must be upgraded to have at least 12 MB of RAM. PhotoGrade enhances
the printed look of images, such as scanned or digital photographs, to
produce added clarity, finer shading, and better contrast. For documents
that require images to be printed with the best quality that the printer can
produce, turn PhotoGrade on.
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Sides Tells the printer to print on one side of the paper or on both.
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Memory Configuration The amount of RAM installed in the printer.
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Cassette Indicates whether you have installed the optional 500-sheet
feeder.
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Duplexer Indicates whether the optional duplex printing unit is installed.
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Output Tray Tells the printer where to direct the media.
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