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Also, although not necessarily the root cause based on the symptoms you are describing, the AT28C256 comes with a software data protection feature which, if it was somehow enabled prior to shipping, needs to be disabled. Ben's EEPROM code does not unlock these chips. If your testing reveals that the EEPROM was in fact not written to, then one option would be to implement u/nib85's TommyPROM arduino programmer, which supports unlocking. It uses a few different chips, but you can make it work with Ben's hardware. There is a section somewhere in the hardware notes that speaks to that.