Color LaserWriter 12/660 PS is the extended version of the original color LaserWriter 12/600 PS, 12/660 engine and plastics are identical to the original in all respects, and all output and the number of parts for service apply equally to both printers. The only differences between the two versions are in packages and setting, ROM and RAM in I/O controller board and driver software.

Color LaserWriter 12/660 PS requires two additional steps during installation, the alignment of the printer and the removal of oil absorption sheets of the fuser Assembly.