On Thu, Mar 14, 2019 at 09:28 PM, Maurice Smulders wrote:
There might be a more elegant solution possible. The problem of battery ram
was discussed at length in the pinball forums, and people made other
solutions for it. Permanent ones. No battery to replace EVER.
For example:
Now, I couldn't find a 32Kx8 variant, but the RAMTRON chip you'd likely
need is the FM1808. Mouser seems to have it in stock, but at a pretty hefty
price, and you'd have to make the breakout board still (JLPCB maybe?)
There seems to be stock on eBay for lower prices from US sellers...
I've done exactly this to my 2430A. I've replaced both of the dead Dallas NVRAM chips with Cirrus FM18W08 FRAMs in off-the-shelf SOIC to DIP converters (Aries LCQT-SOIC28), all bought from Farnell in the UK. The conversion works perfectly as far as I can tell, and the scope will never have dead batteries again.
One day I might try the same trick on my CSA803A.
Chris
