EPROM baking

When I was at Intel, years ago, I recall the baking was only to repair the retention of the EPROMs. It was not to fix random failures. It sounds like your EPROMs have various failures that wouldn't be helped by baking. Each time the EPROM is programmed, there is a slight increase in the leakage of the floating gate. This was typical after thousands of program/erase cycles. Baking them repaired the damage to the insulating layer that was damaged. Dwight ________________________________ From: cctalk <cctalk-bounces at classiccmp.org> on behalf of william degnan via cctalk <cctalk at classiccmp.org> Sent: Wednesday, December 13, 2017 6:18:16 AM To: Mark G Thomas; General Discussion: On-Topic and Off-Topic Posts Subject: Re: EPROM baking On Wed, Dec 13, 2017 at 9:08 AM, Mark G Thomas via cctalk < cctalk at classiccmp.org> wrote: Mark, If this is an issue about reviving bad eproms? I assume you have tried the regular stuff. What process are you using now to erase 2708/16's? I have a simple eraser unit and it seems to always work. Some eproms go bad but I never have issues with erasing them. My point is that maybe you need a better prom eraser unit. I would avoid baking them until you have exhausted other options. Not sure what others think. This topic has come up before here, about putting them outside and all that. The erasers are all over ebay, and the hardware store is full of the correct types of lighting, why not make a box that will do the job? I assume there is more to it that simply erasing them. Bill