What is it, Octane?
#11
RE: What is it, Octane?
(07-23-2025, 02:47 AM)weblacky Wrote:  In C79A picture, semiconductor U8 exploded as well.
Based on pictures cap layout on C234 is same on Octane SSE card: http://www.sgistuff.net/hardware/systems...e-1802.jpg

Wow, I would not have noticed U8. Good eyes!
Yup, it's a ESSI/SSE board.

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07-23-2025, 03:18 AM
#12
RE: What is it, Octane?
I'm guessing U8 is a memory chip. It seems like EPROM chip, though it looks different than the on google shows:
https://www.analog.com/media/en/technica...DS2505.pdf

This is interesting, but over my head.
Do chips like these get initialized when the board comes online or was it programmed at the factory, and not something one can just easily replace?

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07-24-2025, 02:12 AM
#13
RE: What is it, Octane?
I don't think it's different, it appears to be the TSOC package (shown on the first page...just the entire side to blown out..see the test pads on both sides?  Three connections on two sides, but the top side is complete not-connected internally, so they are used only for mounting the SMD package into the board.

Problem is...overvoltage happened on the DATA/PWR one-wire line...that's really bad...because there is a controller somewhere that READS that write-once (paged memory) EPROM...which means the entire one-wire bus (even if it's just a single microprocessor to one slave DS2505 device that blew, experienced way too much voltage on the entire comm bus...so that "controlling" microprocessor is also likely damaged!

These EPROMs are still sold and are a page at a time write-once programmable storage.  They are not meant to be altered after writing, but you can write sections at a time and unused sections can later be written to at a later date.  Programming requires a pretty common EPROM programmer but uses higher voltage to write so likely they didn't allow field-programmable functionality.  So it's highly likely to be a "program then solder to the board" affair.

It's likely this was used to, at least, store the serial/device information of the device that is read during device initialization to identify it to the Octane by part number and such.  It MAY have stored firmware for its controller, master, microprocessor.  We would have to get a duplicate unit and read what's on it to know that.

Somehow something failed in short in a bad way...not in an "open" good-way.  Too much voltage went through something into the one-wire comm bus that EPROM uses and damaged everything attached!

I'd say that's likely NOT repairable...because the damaged MUST extend to the system on the card that constitutes its "brain" that read those values and also maanages/responds/execute operation requested from the Octane over the XIO bus...that "brain" MUST have custom firmware...so even if replaced would be missing its custom programming by SGI during factory production. 

Without finding that component we don't know whether the firmware is programmed directly into storage inside the controller or the controller automatically starts and reads it firmware from an external chip, that COULD be cloned. 

There is a equal chance that such hardware of this vintage may use external storage and so it may be possible to replace all the necessary chips after cloning all info from a duplicate board and simply copy the EPROMS (assuming no "protection" is in place to keep us from reading them) to new units and then solder them to this board... However it was becoming more common at this time in history for microprocessors to have their own internal storage that could be protected against espionage that would've been specially program during production and then sealed off. If that's the case then unless you're going to steal a working brain from a duplicate graphics board there MAY be no way to fix this board. Because you could replace the chip but without the custom programming, it has no brain.

You would have to catalog every major semiconductor on that entire card, searching for what could be the brain and also what's damaged or connected to that bus. All chips connected on it or through it would have to likely be replaced. Any chip that carries internally programmed memory, that is under protection and cannot be read out, stops the entire process of cloning a working unit's firmware onto new chips for replacement for this card.

It's now just connectors and basic parts only...it's very likely brain dead.

I'll also say that while every part has value, this is IMPACT not VPro, so there's likely no value in doing it other than someone's educational value or experimentation. If this were a V8 or a V10... It would be worth the attempt given the value. But the older graphics cards just aren't so valuable that it's worth much. As a board and its connectors it has some value, not zero, but unfortunately since power snuck into the internals past all the protection and blew the low-voltage internal comm line, you'd have to investigate the extent of the damage. Then you'd be able to act but it would be quite a bit of research for a low value graphics card.

It would however be valuable to know how the heck that much power got in there! Because what it might mean is that there's some component on there, whether that's a capacitor or something, that really should be refreshed/replaced before this happens to other cards of the same design.  Obviously this is a design flaw, most of the time you would engineer multiple safeguards to blow out as fusible links that would keep this much power from getting to an internal low-voltage communication line. So that sets a precedent that doesn't sound very appealing for long-term collectors.



(07-24-2025, 02:12 AM)Podboy Wrote:  I'm guessing U8 is a memory chip. It seems like EPROM chip, though it looks different than the on google shows:
https://www.analog.com/media/en/technica...DS2505.pdf

This is interesting, but over my head.
Do chips like these get initialized when the board comes online or was it programmed at the factory, and not something one can just easily replace?
(This post was last modified: 07-24-2025, 04:15 AM by weblacky.)
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07-24-2025, 04:13 AM
#14
RE: What is it, Octane?
(07-24-2025, 04:13 AM)weblacky Wrote:  It would however be valuable to know how the heck that much power got in there! Because what it might mean is that there's some component on there, whether that's a capacitor or something, that really should be refreshed/replaced before this happens to other cards of the same design.  Obviously this is a design flaw, most of the time you would engineer multiple safeguards to blow out as fusible links that would keep this much power from getting to an internal low-voltage communication line. So that sets a precedent that doesn't sound very appealing for long-term collectors.

Thanks for the run-down weblacky. You reinforced a lot of what I was suspecting. A tempting, simple cap replacement project just became a very large "I definitely don't have time for this right now" rabbit hole.

Follow up question: What will it take to convince someone here, smarter and more qualified than me, to take it off my hands for the cost of shipping? Hopefully, of course, with the admirable, educational goal of finding out WTF happened and how we may avoid it in the future.

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07-25-2025, 01:41 AM
#15
RE: What is it, Octane?
Well I might have an interest in the future but I have such a backlog of stuff that I really can't take anything at the moment. I personally have octanes that have the highest impact version with TRAM addons in them which may or may not follow a similar component layout. So from that standpoint I might have an interest.

I'd say you can either advertise them or just hold onto them and in the future if I have a free point in my queue when I get to octane research/repair postings, offer them to me again.

Someone who needs the XIO connector and is very good at soldering rework could definitely reuse those kinds of things. Also for any rusted or damaged video output connectors.
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07-25-2025, 02:18 AM
#16
RE: What is it, Octane?
Weblacky, just a brainstorming thought, given all the modern tech available these days. Would it be possible to make something that provides VT100 emulation to show Console output, plugs into the serial port, connects to a monitor via HDMI, driven by USB kybd/mouse? I found this:

https://geoffg.net/terminal.html

I was wondering if there was anything newer, or if you'd heard of such a thing.

For SGIs of course it would be handy to have different types of serial port.

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08-08-2025, 12:05 PM
#17
RE: What is it, Octane?
(08-08-2025, 12:05 PM)mapesdhs Wrote:  Weblacky, just a brainstorming thought, given all the modern tech available these days. Would it be possible to make something that provides VT100 emulation to show Console output, plugs into the serial port, connects to a monitor via HDMI, driven by USB kybd/mouse?

I think that this kind of device is only useful when no portable computers are at hand; it's just less capable then a laptop emulating a terminal.

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08-08-2025, 12:58 PM
#18
RE: What is it, Octane?
It’s interesting you bring this up. I have thought along these lines several times in the past several years. I’ve had to ask myself what would it do, what would you need it for, why would you use this over a laptop? Here is what I’ve come up with:

I think there is room in the market for what I call something that’s a like to a mobile crash cart.  Basically a laptop form facter screen, keyboard, media hub, and touch surface/mouse that plugs into a server or desktop system when their peripherals are damaged otherwise gone. Not quite the same as a mobile dumb terminal, but basically a tech aid device that collapses the entire mobile crash cart you use in say a data center or a co-locator down to basically a laptop that allows directly attaching its peripherals to another system to act as those peripherals. This is obviously in lieu of KVM style equipment.  You could run the entire thing with one USB-C cable from a modern system and then you could have ports for a much older systems if that was unavailable all on one ultrathin folding device. 

Then there’s the idea of the modern dumb terminal, as cool as that might be there’s no real call for anymore with sophisticated terminal emulators. I thought of it, but when you really think about it hard, it doesn’t sound like a real problem.

So you have to kind of work with what we have, you could get a mobile monitor and keyboard, but they wouldn’t be compatible with most SGIs. 

The closest thing I’ve come up with, out of my own equipment, is much older ultra portable laptops that have expansion slots, i.e. PC card/cardbus/PCMCIA and I’ve placed both single or dual/multi ported serial cards in that slot. The laptop itself is old enough to have its own slot, it’s a Dell D420 latitude.

so if I play my cards right I have three serial ports that are pretty real. You could just as well get very high-quality USB to serial port adapters and they would probably work just fine for most situations as well. So then the issue becomes how do you transfer to the local system. Right now I rarely deal with systems that actually fully run an operating system so it’s not really an issue, but if I had to, I’d have to learn an implement some kind of X or Z modem protocol, sort of technique in order to use the serial interface to copy files down, depending on the OS I run on the laptop. Otherwise I use wireless networking to ethernet via FTP on the SGI or potentially it might be possible if I was running Lennox on the laptop that I could implement SLIP to the SGI using some sort of UUCP?

This gives me a relatively simple implementation, but there’s a lot of cables involved. I have my power cable because the battery doesn’t really work and I have my serial cables because of course I have multiple serial cables!

I think if I had a very integrated environment, I would try something like Jan-Jaap has… a large serial console terminal system. A large switch like device that actually has 8P8C RJ45 connections that are all serial ports that you basically tell me into or you use some sort of web interface to interact with.

Those have the ability to have 24 to 48 serial ports so there’s plenty to hook up and they use normal network cable so you can fairly easily make your own adapter by using old-style serial to RJ45 adapters.  After giving it thought for a number of years. I think this solution is actually the best one when you have a lot of machines and you want some on a maintenance cycle with serial interface and sometimes you need two or three serial ports on one machine, no problem, just whip out a bunch of extra long, ethernet cables with the appropriate adapters and snap them in to your SGI and then take out your normal ultra portable every day laptop of any maker model and remote into the terminal switch device and just start working. I think, even though this is one of the bulkier implementations I think as long as you specialize the area ahead of time it’s one of the quickest and easiest to do an adhoc serial port.

That doesn’t help the monitor/keyboard scenario for graphical usage. That’s one. I really don’t have a real answer for. A part of me wanted to do the exact same thing you do with the serial terminal, use a KVM end point for an older version that’s compatible with SGI systems. There are a few that were made, and you could get your hands on them. As long as you a standard 13 W3 to VGA cable adapter ahead of the old VGA KVM PS/2 KVM endpoint.

The problem is using an old KVM system is you’d be stuck using the physical station’s monitor & keyboard interface as most of them use a Java web interface for their remote features and all of that is broken on newer systems. Unless you put a newer KVM on the old KVM‘s master controls to get around this problem there’s a big problem of software. Unless you’re going to run an old laptop that runs that old software in order to even use the system, which kind of negates everything.

so I hope that answered your question, I’ve thought along the same lines and I still think you either should run a bunch of serial adapters on an ultra thin laptop if you want the direct multi terminal experience. Otherwise, I would establish a terminal server infrastructure, using a large terminal device switch. 

For the graphical peripherals compatible with all SGI‘s, I don’t have any cool ultra portable solution. My current solution is a high-end DeWalt folding construction table, it’s a great table, that folds up like an old style poker card table. So you take the table wherever you need they need to deploy it that I have a Series of 17 and 19 inch monitors that easily interface with SGI’s and a PS2 keyboard and mouse along with a power strip. That is what I currently use as my around the residence mobile SGI workspace.

I admit that I wish I could find a way to plug in the monitor and keyboard and mouse directly into my ultra portable laptop to use on the SGI equipment, but I just don’t see a way to do it without a bunch of very special devices that just would make it a mess of cables and dongles and special software that would make a cumbersome implementation,


(08-08-2025, 12:05 PM)mapesdhs Wrote:  Weblacky, just a brainstorming thought, given all the modern tech available these days. Would it be possible to make something that provides VT100 emulation to show Console output, plugs into the serial port, connects to a monitor via HDMI, driven by USB kybd/mouse? I found this:

https://geoffg.net/terminal.html

I was wondering if there was anything newer, or if you'd heard of such a thing.

For SGIs of course it would be handy to have different types of serial port.

Ian.
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08-08-2025, 02:50 PM
#19
RE: What is it, Octane?
(08-08-2025, 02:50 PM)weblacky Wrote:  I think there is room in the market for what I call something that’s a like to a mobile crash cart.  

A bit off-topic, but at my place of employ we have a mobile crash cart with an EDM (electrical discharge machine) that we use to zap/disintegrate cutting tools (typically thread taps) that have broken off inside a workpiece.

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(This post was last modified: 08-08-2025, 10:58 PM by vishnu.)
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08-08-2025, 10:57 PM


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