[rmpfyf]

So, an update.

I took a breather from this project and ordered an IBM PS/2 keyboard (P/N KB-0225, manf'd 2005) and lo and behold it works fine. Boots normally. Resetenv would not bring my mouse back into being though it's a $1 parts bin special. Plugging the mouse during Command Monitor gets me a red cursor on screen which won't move, so we're halfway there. No harm replacing the mouse now.

Still self-tests OK.

[rmpfyf]

Update.

Got this puppy a new keyboard, which made it happy again as described again. Got a new mouse. Now keyboard not working.

Pulled apart the keyboard (NOS mind you) and it's blown a resistor. Completely burnt it. Checked the last keyboard and it ate that too.

Hmmm.

Would seem it gets loaded up, drops voltage, ups current (quite a lot), sadness.

Something on the motherboard is unhappy. Any ideas where to go? I'd imagne there's some old components on the mothreboard that are gettin' old. Has anyone gone through this much?

[weblacky]

No, however you should check the actual resistance against labeled resistance. I’d more believe failing resistors in keyboard over Octane. But could be anything.

[rmpfyf]

No, however you should check the actual resistance against labeled resistance.  I’d more believe failing resistors in keyboard over Octane.  But could be anything.

True... though it's killed two so far!

Need to replace that resistor.

[miod]

Everything SGI that has an RS-232, 9-pin serial uses an industry standard serial port in my experience. This includes the Onyx2, Origin 3x0, Origin 200, etc.

The personal and professional irises (4D/*) sport DB9 serial ports but use a different pinout.

[Eschaton]

I just received an Octane2 that a friend was holding, and unfortunately its mouse port is not working. No SGI PS/2 mouse that I has works with it but the diagnostics don’t report any issues, and each mouse works with my O2 and Octane. Thus I suspect the Octane2’s PS/2 mouse port is fried.

What are my options here? Are there any microfuses (or non-micro) that can be replaced? Is this even reparable at all?

[Raion]

Check the resistors that trace to it. There's no pinouts for this, you're gonna need to use a continuity checker.

[weblacky]

I agree, I would actually check that you have power on that port. I would also put a PS/2 connector into the octane while it’s board is out and use a multimeter to check that all the pins that need to make connections are actually making a connection on both sides of the connector (board side to plug side). This will show if you don’t have a shorted pins due to rust or bent pins or broken pins first.

If continuity checks out then I’d start to be concerned about signal and things like that.

On a tangent I’ve been extremely interested in replacing rusted or broken SGI ports but I’ve never found what the parts are to order them from a supplier. I’ve recently seen O2 and octane systems and boards come up on eBay that are absolutely rusted to ruin. Which in itself should be a crime. But a simple rusted port should be easily swapped for a brand new working port if a replacement was available.

Right now you’d have to get a donor system to provide that port to scavenge from. That’s not an idea I like. But right now it’s the only that could be recommended if you find the port itself has been abused or rusted.

[dexter1]

If you can't find the fault on the motherboard, an alternative is the Cad Duo PCI Card 030-1155-002 .You need a PCI-XIO shoehorn for this or a PCI cardcage.
This allows you to add an extra PS/2 keyboard and mouse to your octane, as well as a network port.