Apple Color LaserWriter 12/600 PS - Manual (Page 122)

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 printer. Use this dialog box to set up any optional features you may
purchase, such as additional memory or the 250-sheet cassette and feeder.
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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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Tray Switch Turns tray switching on or off.
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