Trouble connecting to AlarmRelay

[dwalt]

The one on the left. It will have a version number like 3.0 and a date like 2009. If you are interested in one, post a picture. By the way, the chips with labels are eproms. They have a window under the label that allows them to be erased with UV light. eeproms do not have the window and are erased electronically.
dwalt

 

[pete_c]

Thinking the very old boards had two. The one you upgraded was the left one as you look at the board. My first OmniPro 2 panel had two and I only changed the chip on the left.

Have a read here from 2014 - first slot is U29.

Need help, which eeprom upgrade