That looks nice. When are you planning on selling the completed GW-1225-1? I would be interested in getting one for sure.
No definite timeline, I PMed you about getting a prototype version though.
Coincidentally I have done a lot of work on the DS1225. This is because they are used to hold the calibration constants in the TEk 2465B scope.
Heh, I laid out the GW-1225-1 due to having a piece of test equipment in the shop with a dying DS1225Y Same with the GW-1220-1 too, as mentioned it now lives in a Prema DMM.
After a lot of research on the topic, I moved away from the DS1225 to Ramtron FRAM
Yeah, FeRAM is *great* when it'll work in an application! I'm thinking about doing a module that qualifies the chip select for situations in which it's grounded. I've found quite a few things that either ground *CS or assert it before the address lines are fully settled. Some things hammer it too hard for me to feel like it's a good replacement, too -- things where the NVRAM isn't just storing configuration or calibration values, but is also being used as part of main memory.
I was the first person to install these in Tek 2465B's
First to write it up, anyway
Here is the original article I wrote back in 2013, and I have been running FRAM in my scopes since that time. There are some interesting remarks in the article about Autostore - Shadow Ram STK12C68 option I tried and a MRAM (Magnetoresistive Ram, that never came into being, even though its data sheet circulated the net) I use this type number (CY9C6264) as a "probe" if some supplier claims to have it in stock, you can then know they are not a genuine stocking supplier.
Great writeup! Thanks for sharing it!