Don't give up, this just arrived. Found this in the admin trash from a user writing from his work address. Bob http://www.turbododge.com/forums/f4/f21/345373-custom-cal-data-other-stuff-= 3.html http://margo.student.utwente.nl/stefan/chipdir/f/eeprom.htm TC97208 Toshiba 32k*8 eeprom. Cheers Rodolfo ________________________________________ From: piclist-bounces@mit.edu on behalf of andrew= kelley=20 Sent: Monday, February 19, 2018 7:04 PM To: Microcontroller discussion list - Public. Subject: Re: [EE]: ancient tc97208/tc97209 datasheet Correct. But if I can write 0s to it (which I can't) proves something in this code isn't right. I can't erase it either. If it was otp, I could at least 0 out the chip and not be able to erase.. Well, I guess I'll just end up modifying the boards and repotting them since absolutely no one has a DS on it. Nothing on Google for a ds, found some code but it doesn't work. This was my last try. Thanks all. Andrew --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .