alt Hacker Newsx86 servers weren't that common in the 90s and early 200s, that was all sun or the other commercial unix peoples things
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In the 90s, perhaps not massively, but gaining ground very early in the 00s. I started my career in 2000 and most of the credit-card related stuff I built until ‘05 was targeted at Windows, Linux and Solaris, with a variety of other Unix platforms depending on the client/project.
But the x86 I was referring to in my comment above, Stratus, was (maybe still is?) an exotic attempt to enter the mainframe-reliability space with windows. IIRC it effectively ran two redundant x86 machines in lockstep, keeping them in sync somehow, so that if hardware on one died the other could continue. I have no idea how big their market was, but I know of at least one acquirer/issuer credit card system that ran on that hardware around 2002-3.
Sun was dying in 2000. I was busy deploying BSD and a bit later Linux for all our x86 gear.