Thanks for all the advice and offers of assistance. I will let you know how this turns out. Andy On Fri, Mar 17, 2017 at 2:48 PM, Herb Johnson via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
The CPU is a Signetics 2650 and the ROM
looks to be a Signetics N82S115N (it's the only socketed chip on the board that I can see).
Google tells me 82S115 is a 512 X 8 TTL bipolar PROM, by finding datasheets. Most ordinary and old PROM programmers don't support that whole class of PROMs to program. But reading it is a different matter.
http://www.retrotechnology.com/restore/fuse_bipolar_prom.html
Build a reader. Or fake a common 5V EPROM and read THAT. It's doable. You're welcome.
Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net