Thank you for your reply. Yes that was one of the issues; I cannot seem to find much information on the BP model although other versions of the chip are claimed to be supported. I understand one of the limitations many programmers have is insufficient voltage for writing these older EEPROM’s.
I’ve taken a shot on this unit from Amazon. It appears to be the official Xgecu store, so hopefully this is not a clone using inferior hardware as often happens with these types of devices. It claims to support up to 25 V peak to peak, which should be sufficient for writing.
https://a.co/d/eFFSjYBI also found some surplus X2816BP chips at an electronic surplus store in Ohio, so I’ve ordered several for testing along with some DIP sockets so I do not have to risk damaging the one in the unit, which does work, but I cannot write to to add options.
Everything should be here sometime next week so I will post updates once I get a chance to test.