I got this weird little embedded system out of a large scientific apparatus that was being recycled. It came in a bespoke metal enclosure which was barely bigger than the motherboard itself. Inside is a bog-standard socket 7 ATX board with a P133 - well, if you can call a rather neat industrial-targeted board with six ISA slots & onboard S3 graphics standard.
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Still, this part works about how you'd expect:
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It was the support gear that was originally installed that's a little unusual. Here it is populated in its original configuration:
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Yeah, the entire thing was controlled by this arrangement of THREE ISA & one PCI card, strung together in situ with ribbon cables. Note how ATX power is delivered TO the motherboard through the bottom card, which is how on/off is handled. NONE of what would be front panel connectors are hooked up (i.e. no power switch, etc.), and there wasn't even any internal storage. The ethernet card didn't have a boot rom either, so it must have booted via one of the custom cards. It looks like the entire PC subsystem here only existed to collect data, process it, and then feed it back out to another component in the thing this came out of. You'd probably read its output externally with a laptop or something.
To be honest, I'm not even sure how I'd start poking at this thing to figure out how it worked. I know what it came out of, and it's NOT something common that you'd find in any old lab. I'm wild-ass-guessing a production run of maybe tens of thousands before that particular model became obsolete.
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