2 links
The OS Files
TheOSFiles.com
Portal for many x86 PC platform operating systems; details, news, information, secret tips, background, links, availability (current, planned); DOSs, Linux, NetWare, OS/2, Unix, Wi…
Vintage OS
vintageos.org
Information, consulting on DOS, Windows, OS/2, Unix, BSD, Mac, MVS, Palm OS, UNIX, and other vintage operating systems.