Free x86 mainframes for all! Virtual x86 mainframes, that is

Unisys' ClearPath and OS2200 are yours for the downloading and running under Windows

Unisys's ClearPath colosso-servers may have finally moved from the weirdness of CMOS to the mundanity x86, but the servers and their operating systems still remain rather exotic and therefore not the kind of thing the curious often get to prod."