HP 220 - Manual (Page 55)

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 Overview C3187Ć90000
Main Processor System
The main processor system consists of the following:
D Main processor (80960)
D ROM
D Processor support ASIC
D Shuffler ASIC with swath memory
D Input/output interfaces
D DRAM
Main-Processor-System
Main Processor
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 androller movements for each swath printed.
ROM
The firmware code is containedin either two maskedROMs 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.