Dallas chips

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praetor242
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Dallas chips

Unread postby praetor242 » Mon Mar 20, 2017 2:20 pm

I had ordered new Dallas chips for my nekkid O2, the only one is DS1687-5+, not the DS1687-5. When I put in the new chip, the O2 doesn't turn on. Where can I get the exact Dallas chip it needs?
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Re: Dallas chips

Unread postby Raion-Fox » Mon Mar 20, 2017 3:26 pm

Why are you replacing the Dallas chip?
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Re: Dallas chips

Unread postby praetor242 » Mon Mar 20, 2017 3:56 pm

Because the time on that system is really wrong. It says it's December 22nd 1983. Unless I'm being stupid and IRIX sets it. IDK.
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Re: Dallas chips

Unread postby Raion-Fox » Mon Mar 20, 2017 4:40 pm

It's possible it's bad.
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Re: Dallas chips

Unread postby praetor242 » Mon Mar 20, 2017 4:50 pm

Well, I know it's bad :p I have a support ticket in with Maxim to find out if the D1685-5+ is backward compatible.
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Re: Dallas chips

Unread postby Raion-Fox » Mon Mar 20, 2017 5:26 pm

So you tried setting the time and it won't remember? Hmm.

There's always sgidepot.co.uk, Ian is sure to know what chip you need and probably have it in stock.
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Re: Dallas chips

Unread postby japes » Mon Mar 20, 2017 5:39 pm

Talk about pot calling the kettle black Raion-Fox...why was it you took apart your O2 cpu again?

If you look at the data sheet, the + version is a ROHS part. I think they discontinued the non-ROHS version ages ago. It is possible that they had some errata they fixed, but I doubt it. If Maxim gets back to you let us know, somehow I figure if they get back to you they'll just say the same.

I think your O2 not starting is unrelated. Make sure your power was disconnected when you assemble the O2 and that the main board seats fully. I've had O2s that I needed to "hug" to get the board in, not just use the little lever (which funny enough broke off one of mine).
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Re: Dallas chips

Unread postby praetor242 » Mon Mar 20, 2017 6:00 pm

Nou :p

I looked at the schematics for both the + and not +. They don't really seem _all_ that different. I'll see what Maxim says. But when a computer says it's 1983...it's probably the clock. And just given the age of these machines I got samples of the D1687-5+ because that's what they had as a replacement part. I don't _think_ that affects the functionality of the machine, because in Irix 6.5.x it's recommended you setup tzdata and ntp.

It'll be interesting to see what Maxim says, because these chips are used in alot of legacy systems.
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Re: Dallas chips

Unread postby pierocks » Mon Mar 20, 2017 7:21 pm

Any blinking light codes? Did you leave the pci riser out?
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Re: Dallas chips

Unread postby praetor242 » Mon Mar 20, 2017 7:26 pm

No blinking light codes. It just won't power on if the new chip is in.
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Re: Dallas chips

Unread postby Raion-Fox » Mon Mar 20, 2017 7:36 pm

japes wrote:Talk about pot calling the kettle black Raion-Fox...why was it you took apart your O2 cpu again?


I was simply narrowing it down. Sometimes I've found that the time was set incorrectly when I get the computer, but once I have set the time, it'll hold it even if I unplug it.

On some SGIs, doesn't the 'number in a can' instead of a Dallas chip control the RTC? I know the O2 has something like that built into the riser, or maybe I'm thinking of another SGI for some reason.

As for taking the CPU apart, 17 years has been a long time for thermal paste to get better. Wasn't going to hurt anything by reapplying it.
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Re: Dallas chips

Unread postby japes » Mon Mar 20, 2017 9:59 pm

The PCI Riser in the O2 has a Dallas 1-Wire flash chip (3pin TO-92 like a transistor). This stores the MAC address for the O2 onboard network interface. I think there's a MAC address sticker on the riser. The trouble of course is the mac address is also on a sticker on the mainboard tray (or at least on my examples) and mine don't match...The Octane and Origin 2k machines use Dallas 1-Wire iButtons, the same thing as the TO-92 flash chip, different package.

The Dallas chip in the O2 is the RTC and battery backed nvram. This is inline with many SGI machines of that time, Indy being a bit of an outlier with the MAC address in the Dallas chip nvram area. Indigo2s have an 8-pin dip with the MAC address but store time and nvram in a Dallas chip...that is out of production sadly.

Interesting thing about the time on SGI machines, if you use out of the box installs of IRIX 6.5 you get a timed daemon that will set the time of your IRIX machines to match in a network environment. If you keep one machine running the correct time may be set automatically on startup of other machines - unless you check the logs you might not notice your Dallas chips loosing their charge so long as you have default boot parameters...not sure what that means for a R10k/R12k O2 since the first drive bay is blocked.
Last edited by japes on Mon Mar 20, 2017 11:40 pm, edited 1 time in total.
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Re: Dallas chips

Unread postby robespierre » Mon Mar 20, 2017 10:17 pm

praetor242 wrote:I don't _think_ that affects the functionality of the machine, because in Irix 6.5.x it's recommended you setup tzdata and ntp.

That's a non-sequitur. The timezone and date are set in the NVRAM; they have squat-all to do with the OS.
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Re: Dallas chips

Unread postby japes » Mon Mar 20, 2017 11:38 pm

praetor242 wrote:No blinking light codes. It just won't power on if the new chip is in.


Wait, just reread this. I think I missed this. Does the O2 power up if you reinstall the original Dallas part? But not with the '+' version?
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Re: Dallas chips

Unread postby praetor242 » Tue Mar 21, 2017 12:34 am

Yup. It powers up with the original chip. Not the + version.
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