Tektronix 2465B - Help with RAM cloning

[fichamba]

Hi everybody:

I've just received a new Dallas DS1225Y +150 just to make a backup of the one inside my Tek 2465B. I have 2 programmers (I normally use the standard GX-4x4). I extracted the data from the original Dallas chip, created a .bin file, and copied into the new chip. In spite of this, when I install the new chip inside the scope, I have 4 errors. The scope starts up, but it does not show the text lines correctly. In the original Dallas chip It doesn't mark the speed (+150). Also, it has no "pin 1" marking. Was bought in Italy.

Any ideas will be appreciated.

TIA

[jonpaul]

Unfamilira with any NVRAM prog except the notorious Chinese MiniPro XGecu.

Beware of pulls, rebrand, old NVRAM. Mouse/DK are reliable sources.

If the scope is in CAL, the image is useful.

If not, or if the image is curropted/lost a recalivbbration may be needed.

See many long theread in EEVBLOG, esp "2465B teardown" 79 pages.
Suggest to mirro your  screens, error messages, here and  to groups.io: Tektronix and Tektronix2

Bon chance

Jon

[EggertEnjoyer123]

Try reading the chip again to see if the data is the same. You can use a diff utility to compare them.

[TERRA Operative]

What is the date code on your new chip?

If you didn't buy it from an official supplier, you could have gotten anything....

[fichamba]

Today Spain is on holydays, but tomorrow I will go to the lab and look to make everything you had said: trying the data, and take a pic of the "new" Dallas IC (I suspect a lot about it).

I also looked in Digikey, and find out one chip in stock which seems to be fully compatible with the original one (as I saw in one thread; one user was able to clone it):

https://www.digikey.es/es/products/detail/analog-devices-inc-maxim-integrated/DS1225AD-200IND/1196785

Of course, thanks to you all for sharing your knowledge and ideas. I will keep you informed.

Jesus

[TERRA Operative]

The other option is to use an FRAM in place of the Dallas chip.

Buy an FW16W08-SG and these PCB's linked below and you'll never have a battery problem again.
https://www.pcbway.com/project/shareproject/Dallas_DS1225Y_FRAM_Adapter_3c961bed.html

A user on the tekscopes groups.io group just recently sucessfully performed this upgrade.

[jonpaul]

DK and Mouser are reliable suppliers of the Dallas NV RAM, the -150 is not important (speed)

Use a very good desldering equip, get a low profile machined pin 28 pin socket.

Jon

[fichamba]

GREAT! I did not make the code comparison yet, but in the meantime here you have the pics. The 3rd one is the "real" chip which came with the scope. The 1st and 2nd pics are from the spare bought in Italy (I saw the back has the chip mostly centered, and the original one is almost at one side).

Of course, the definitive solution will be the Cypress chip design from NFM (thanks, TERRA Operative!). Pity is just tomorrow morning I've ordered the chip from my previous message to DK. Any way, I think it's a good idea to have it, and in the meantime ordering to PCBWay (I don't know how much it will take for the PCBs to arrive here to Madrid...it will be my very first ordering to them).

I'll do the data comparison just after writing this post. And here, the pics:

[TERRA Operative]

Hmm, the paint quality and lack of date code on your second one has me suspicious....
It may be real, but it may have been sanded and reprinted to remove an old date code to hide how old it is...

At least you will definitely get a good one from Digikey. I bought a few 1245AB-85+ Dallas chips recently and the date codes were only a few months old. (I gotta figure out an FRAM/something solution for those too).


Also, NFM is meeeeee!

[fichamba]

Hmm, the paint quality and lack of date code on your second one has me suspicious....
It may be real, but it may have been sanded and reprinted to remove an old date code to hide how old it is...


Also, NFM is meeeeee!

I KNOOOWWWW!!!! HAHAHAHAAAA!!!! BTW: PCBs ordered! 

[fichamba]

Try reading the chip again to see if the data is the same. You can use a diff utility to compare them.

Done. Everytime I do a dump of the original Dallas chip, I obtain a different data. Small changes, but not identical.

Done with 2 programmers: Barlino (from Batronix) and GQ-4x4 (from MCUmall Electronics). Readed with the embedded hex viewers, and also with HEX editor (compared 2 files and are different, no matter what, all of them extracted from the same original, working Dallas chip - ).

[TERRA Operative]

The watchdog/timekeeper chips will have some differences when ripping them due to the real time clock updating a few locations in RAM with the latest time.
For this reason a verification in the programmer software will fail due to this mismatch.

The non-RTC chips should always read the same though AFAIK.

[fichamba]

The watchdog/timekeeper chips will have some differences when ripping them due to the real time clock updating a few locations in RAM with the latest time.
For this reason a verification in the programmer software will fail due to this mismatch.

The non-RTC chips should always read the same though AFAIK.

I thought so. But with this crappy chip doesn’t work.
I understand that will have a change in the time adjustment, but basically it will work.
Is throwing me 4 errors instead (and big bad errors, not a watch out of time error…).

[fichamba]

Just received a new Dallas chip from DigiKey. Nothing to see with the EBay one: cost, equal; time to arrive: 2 days (DK), 14 days (EBay).

So I'm going to check it out just know.

In the attached pic, up is the original chip which came with the scope, and down the newly ordered one from DK. TERRA Operative, maybe you can see the date code there. Also, there is a mark for pin #1.

EDIT: Chip copied and working perfectly!.

[TERRA Operative]

Your new chip is 40th week of 2022, so 10 months old. About right for what I bought too.

Your old one is first week of 1990, so coming up to 34 years old....... so yeah, a little older than the new one.....



Good to hear you got it working, should be good for another 30 years.   

[fichamba]

Your new chip is 40th week of 2022, so 10 months old. About right for what I bought too.

Your old one is first week of 1990, so coming up to 34 years old....... so yeah, a little older than the new one.....



Good to hear you got it working, should be good for another 30 years.   

 

Nice!. Anyway, next wednesday I will have the (your) PCBs from PCBWay to mount the non-powered memory. I have the chips already. They arrived from DK today.

BTW, I am going to see your video, because I don't know hor to clone from the Dallas chip to the Cypress one...

 

[TERRA Operative]

IIRC all I did was copy the Dallas chip to a .bin file, then tell the software what the new chip was, then copy straight to it.

I have some spare ones made ready for future projects, so I can run through it again if you get stuck.

[fichamba]

IIRC all I did was copy the Dallas chip to a .bin file, then tell the software what the new chip was, then copy straight to it.

I have some spare ones made ready for future projects, so I can run through it again if you get stuck.

Done and working! Forget batteries! 

[TERRA Operative]

Nice! Good work!