- HP All in One Printer User Manual

80960
CPU
RS-232
Interface
Shuffler
ASIC
Swath
RAM
Centronics
Interface
2-MB
DRAM
4x8-Mbit
ROM
Demultiplexed
Bus Interface
DRAM
SIMM
Socket
To Servo Processor
System
To Carriage
Processor
System
Processor
Support
ASIC
5Ć23 Functional OverviewC3187Ć90000
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The main processor system consists of the following:
 Main processor (80960)
 ROM
 Processor support ASIC
 Shuffler ASIC with swath memory
 Input/output interfaces
 DRAM
Main-Processor-System
 
The main processor interprets graphicsĆlanguage commands received through the
input/output (I/O), prepares a bit map of the data to be printed, and issues commands to the
servo processor to synchronize the carriage and roller movements for each swath printed.

The firmware code is contained in either two masked ROMs or four EPROMs on the main
PCA.
The EPROM integrated circuits are socketed; Move them from the old Main PCA to the new
one, when you replace the Main PCA.