On Jun 15, 2015, at 1:56 PM, Ian McLaughlin <ian at platinum.net> wrote: > All zeroes is really strange - a blank EPROM is all ones, so it’s not that it got exposed to UV light. It definitely does seem strange. I wonder if maybe it’s a TI style 2716? It’s a National Semiconductor MM2716Q. -- Follow me on twitter: @FozzTexx Check out my blog: http://insentricity.com