[cz7asm]

Hi,
I got hold of an O2+ machine that doesn’t power up and I found inside a home made pcb module mounted on the pci riser slot. Any idea what that might be?
   
   

It seems to be connected to pcb pads that are normally used for a transistor looking part, which is not populated in this case.

I also wonder whether it’s ok that the processor is missing the big heat sink which is present in case of O2 non plus machines.
   

Thanks for help!

[Raion]

Dunno on the module.

As for the CPU - you have an R7000 unit. That's entirely normal. Not all O2+ units were R12000 powered.

[robespierre]

I got hold of an O2+ machine that doesn’t power up and I found inside a home made pcb module mounted on the pci riser slot. Any idea what that might be?

Looks like a device to interface with Dallas 1-wire interface to emulate the DS2502 NIC ("Number In a Can"), which SGI uses for the machine serial number. I'm pretty sure it's related to that because it has "DS2502_CPC_01/2003" in the corner. Also the creator seems to be named vladinoo.

I also wonder whether it’s ok that the processor is missing the big heat sink which is present in case of O2 non plus machines.

The R5200 processors run much cooler than R10000 or R12000 and don't need a big heat sink.

[weblacky]

I got hold of an O2+ machine that doesn’t power up and I found inside a home made pcb module mounted on the pci riser slot. Any idea what that might be?

Looks like a device to interface with Dallas 1-wire interface to emulate the DS2502 NIC ("Number In a Can"), which SGI uses for the machine serial number. I'm pretty sure it's related to that because it has "DS2502_CPC_01/2003" in the corner. Also the creator seems to be named vladinoo.

I also wonder whether it’s ok that the processor is missing the big heat sink which is present in case of O2 non plus machines.

The R5200 processors run much cooler than R10000 or R12000 and don't need a big heat sink.

Wow, you mean a custom modded SYSID!  I've never heard of anyone doing this!  Has such a thing been documented before?  I mean I'd see a big advantage of having usable circuits to do this on All SGIs to reuse licenses (since no new licenses can be issued).

[Raion]

Perhaps, but that's also a huge potential legal thing. I've never received threats granted, but I'm hesitant to list any autodesk or adobe products at length for that reason.

[robespierre]

Wow, you mean a custom modded SYSID!  I've never heard of anyone doing this!  Has such a thing been documented before?  I mean I'd see a big advantage of having usable circuits to do this on All SGIs to reuse licenses (since no new licenses can be issued).

The change_sysid script isn't sufficient? The data is at a specific symbol inside kernel memory, it's only read from the Dallas chip during boot.

[weblacky]

I thought the change_sysid that didn't work for all SGI systems? Does it?

[jan-jaap]

Of course it does.