Hey, that's my hand!
I had to pop the cover off my 54657A to iron out this hickey:
PIC
in the shell, so I took a couple pix of the inside for comparison and future reference.
Yup... DALLAS DS1244Y-120 & DS1245Y-120; I read the date as 2002, so maybe a few more years if I'm really lucky.
Ghaaaah. ~$90 just for the two NVRAM, then I need to get a working programmer. *sigh* I also need to do the same thing with the NVRAM in my 3478A...
Nope. If I'm gonna spend that money, it'll be on the 54659A I actually want on my scope, not this module that I bought just cuz it was cheap and right there.
I'm just gonna button this one up and use it til it loses its mind.
mnem
*tinker-tinker... putter-putter...*
I can send you over my old Willem Then you can convince it to work from an RPI GPIO using Python
As side inspiration, I've seen some Dallas replacement projects, but for TEK - sorry Maybe is time to do it for HP?
You mean like this and the similar mod for the 246x family?
Or you mean hacking the epoxy and doing one of these...? Given how expensive the chips are, might do that once any data is extracted; but not likely gonna wanna try that on a live NVRAM still on the board...
For extracting the data backups I've several times considered doing something like the AR488 GPIB:
https://www.eevblog.com/forum/projects/ar488-arduino-based-gpib-adapter/
But so far, I have not been able to convince myself to take the deep dive.
mnem
Hey, that's my hand!
I've been thinking of taking to a Dallas NVRAM with a bastard file, take the top off and expose then remove the old battery and glue a new battery holder on top.
The good thing about the TDS500, 600, 700 series scopes is the cal data is held in some I2C PROM chips on tje acquisition board so you don't need to recal after playing with the NVRAMs.
It's trivial to read out the contents of the NVRAMs via GPIB, have at the chips to make a Frankenstein's monster, then stick them back in and load the data back on via GPIB again.
Might be more dicey for equipment that has cal data and other critical data unless you rip and dump it, but once you have a copy of the data backed up, file away!