I can vouch for Andrews nvram working in System 80b. I've put several in System 80 and 80b (Mars, GoldWings, Hollywood Heat) machines without issue.
Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside