About NES: I'm currently listing regressions compared to 0.130 (just a couple that I can see and one of them, the crash in Lagrange Point, has already been fixed locally) and other crashes/freezes which were occurring also in the past
After that, I plan to add a bit of info I collected in the past on mappers [1] (both the supported and the unsupported ones) and to try my luck with adding a few more mappers for chinese bootlegs
[1] I've always been disappointed by the lack of info on most of the mappers. either you check the source of other emus (Nestopia and FCEUMM) or you are on your own... hopefully, MESS source could be a good place to store some of the info