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
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.
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