Apple Color LaserWriter 12/600 PS - Manual (Page 11)

The Color LaserWriter 12/660 PS printer is an enhanced version of the Color
LaserWriter 12/600 PS printer. Enhancements include
m additional 4 MB of memory (16 MB total in the printer)
m improved software and firmware to speed up printing
m new printer drivers
Use this update in addition to the Color LaserWriter 12/600 PS User’s Manual.
This update describes the features unique to the Color LaserWriter 12/660 PS
printer. For detailed instructions on setup, transportation, installing options,
and other topics not discussed here, see the Color LaserWriter 12/600 PS
User’s Manual.
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What’s New