[dstep]

Hello

Each time the power is turned off, the variables in NVRAM degrade. The longer the shutdown, the more variables suffer.
It seems to me that the Gazelle chip is most similar to the RTC. Am I right?
Does somebody know where is, and how to replace battery of IP15 board?

Also, although it seems doesn't concerned RTC battery, but after each reboot date/time are reset to zero (1970). IRIX 5.3 XFS is installed. Anybody knows how to fix it?

Regards
Dmitri

[jan-jaap]

Hello

Each time the power is turned off, the variables in NVRAM degrade. The longer the shutdown, the more variables suffer.
It seems to me that the Gazelle chip is most similar to the RTC. Am I right?
Does somebody know where is, and how to replace battery of IP15 board?

Also, although it seems doesn't concerned RTC battery, but after each reboot date/time are reset to zero (1970). IRIX 5.3 XFS is installed. Anybody knows how to fix it?

Regards
Dmitri

It's not on the IP15 CPU board but on the I/O board (IO2 or IO3).

If you pull the IO board, you will notice the 4 ROM chips and right next to it a sort of sandwich of socketed chips. On top is an SRAM chip, underneath the RTC + battery backup.

I believe this type has been out of production for years, so you will have to open it up with a Dremel, disconnect the internal coin cells (there are two!), and attach an external 3V battery.

[CB_HK]

Here's a link to the thread where I had to do exactly that for my Crimson's IO3B.

https://forums.irixnet.org/thread-555.html

[dstep]

Thank you both very much. I have seen such method (dremeling), but for another more modern type of chip and board, and I did not know where the battery is.