I'm planning to build a computer with circa 1999 parts to play p99. I know it's not strictly necessary, but I'm a sucker for old computers.
Naturally, I started with an appropriate processor. EQ required a Pentium MMX clocked at 166mhz as a baseline, so a Pentium 2 at 400mhz should do nicely. Not only were they available for a couple of years at that point, but they're also 5 dollars on eBay.
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Finding motherboards that accept this motherboard shouldn't be too difficult, as the giant processor slot shouldn't be hard to spot.