User manual

95.08.23.11.31
Color LaserWriter 12/600 PS Basics & Theory 1–139
Outline
The I/O controller in the printer converts the print data sent by external
devices, including the host computer, into dot data, which is then output
from the I/O controller to the DC controller. The types of interface
signals transmitted between the I/O controller and the DC controller, as
well as an outline of the operation of the printer using the interface
signals, are described below.
Note: For more information on the I/O system interface, see the
following documents that are bundled with Service Source.
• “Inside the Color LaserWriter”
This is a short 15-page document that graphically illustrates the high-
lights of the controller technology in this printer. Included is a descrip-
tion of Color PhotoGrade, Contone compression technology, and
general principles of digital color imaging.
• “Developer Tech Notes”
This is a product of Apple Developer Technical Publications and
contains all the information that developers receive. Chapter 1
discusses some of the broader issues of the printer, such as pinouts,
connectors, extended memory, and the like.
Printer
External Device (Host Computer, etc.)
Status PanelI/O Controller Board
DC Controller Board
Scanner Motor
Drive Signal
(/SCNON)
Video Data
Signals
(Dv2-Dv9)
Laser
Driver
Scanner
Motor Unit
I/O Interconnect Board