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Known mostly as a software company, it surprised me a bit when I came across the article Dump Switch Support for Windows at Microsoft’s site a few years ago. This site has a schematic (which appears to have been done in Paint, detailing a PCI device for generating an NMI to force a machine to bugcheck and dump.
Many servers have NMI switches built in, but it’s quite nice to be able to add one to a PCI slot bearing device of your choice. I think it’d be nice to know how to do this on PCI Express, but it’d take me a little time to figure out how. It’s probably not as easy as this implementation.