The PC Server 500 is a more server oriented extension of the Personal System/2 Model 95/A. It's also one of the few non-beige systems of the era sporting IBM's "industrial grey" or "pebble" as IBM officially termed the colour. They are affectionately known as the "greyghost" by some. One of the OS/2 guys I know had access to a bunch, but they're so large and unwieldily that they were ultimately recycled, and had I have even known about them way back then, they're such large systems it really takes a commitment to store and own one. :(
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