Apple ColorLaserWriter 12/600PS - Manual (Page 154)

The Color LaserWriter 12/600 PS has several user-installable printer
options. You can add a 250-sheet feeder (containing a universal cassette), a
250-sheet universal cassette, and external hard disks or an internal hard disk
for font management. You can also increase the printer’s random-access
memory (RAM).
This chapter provides instructions for installing these options.
WARNING When installing any of the options described in this chapter,
be sure the printer is turned off.
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Installing Options