17 Mar
2017
17 Mar
'17
2:48 p.m.
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