Dallas DS1486 and DS1250 Replacement designs

[Tantratron]

DS1384G such as from the adapter are still available on ebay.
I just ordered 5 pieces so I will make 5 adapters

Note some recent progress here https://www.eevblog.com/forum/testgear/i-noticed-nvram-replacements-for-the-tds784d-on-ebay/msg4632898/#msg4632898

Let's see how it goes through time.

[max-bit]

There may be some incompatibilities.
But in general it should work.

[Tantratron]

There may be some incompatibilities.
But in general it should work.

Upon your analysis, what would be the incompatibilities of cuebus design ?

[ltarjanyi75]

+1 successful build of cuebus design (for the first try  ). I have just put them into my 744A.

Ordered the DS1384G (3 pcs) from China and it works perfectly, PCB from jlcpcb.
I have tested the board outside of the scope first with an Atmega4809 on a breakout board (didn't had an Arduino Mega or similar with lots of GPIO. It was quite a mess with all the jumper wires but worked) and with some arduino sketch. I could read/write the NVRAMs and could get out the squarewave from the assembled 1486 board.

I also copied the NVRAM backups made from the scope to the boards before putting them into the scope. It booted up and worked with it, but had some problems (e.g. it froze when I went to the error log menu). Probably I made some mistake during the write, which I did not compare byte by byte with the backup, just did a quick eye check...
So I restored the backups with tektool to the NVRAMs and it works! Big thanks to cuebus!

(Check the soldering carefully pin by pin as others suggested before! It is easy to make shorts...)