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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Program ROM
Location 05D: 27C1024
This 64k x 16 bit (Mbit) EPROM contains the control program for the printer. The MPU executes
the instructions contained in this program.
The Program ROM is assigned to the program memory area of the MPU and instructions are
fetched by the PSEN signal of the MPU.
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