How did real-mode Windows implement its LRU algorithm without hardware assistance?

Raymond Chen August 10, 2012 Aug 10, 2012 08/10/12

I noted some time ago that real-mode Windows had to do all its memory management without any hardware assistance. And yet, along the way, they managed to implement an LRU-based discard algorithm. Gabe is really interested in how that was done. As we saw a few months ago, inter-segment calls were redirected through a little stub which ...