Rockwell Automation T3122 ICS Regent Processor Modules - Manual (Page 14)

Processor Modules (T3110, 11, 12, 20, 21, and 22)
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Figure 7. Processor Module EPROM locations.
Remove EPROM U42 from the main processor board by
rotating the chip socket’s retaining clips outward. This will
eject the chip from its socket. Remove the old EPROM and
place it on antistatic foam off to one side.