Louis Ohland's actively managed site for all matters IBM PS/2 related, plus other things:
http://ps-2.kev009.com/ohlandl/
There exist a number of out-of-date mirrors from its previous location, when it was going offline from charter.net
Also, there are adaptations and subsets too. You choose what suits your needs, but Kevin (our hosting benefactor) has
mirrors and links (some of which may be dead) of the most prominant:
http://ps-2.kev009.com/