Recommendations for operating system

Pentium and Pentium Pro systems are both on-topic. Furthermore I've seen interesting examples of both. I'm saying this as someone who has absolutely no interest in collecting either. As has been pointed out, systems of this era can be useful in working with even older systems. Plus, (and this is an area I am interested in) they can be useful for running old "dead" OS's and old versions of "live" OS's. The question here becomes what do people use thier "classic" machines for? I've actually been considering building a Windows 95 or 98SE system to play some old games. Probably do it so it will dual boot MS-DOS. Another comment I saw was that a system shouldn't be here till it is no longer useful for real work. That would make this a very small narrowly focused list. The 10 year rule makes sense, especially with the "Coolness exemption". For an example of the "coolness exemption", NeXT HW and software was defintely off-topic on this list when it started, but no one complained about it being discussed. Lets face it, there is some pretty cool hardware even in the last 10 years, you start looking at everything from when this list was started through about 10 years ago, and there is even more cool and interesting stuff. If something being read doesn't interest you, fine, no one is forcing you to read those threads! Zane