Pretty good idea. Wika has become a mess with advertisements and garbage these days ( I actually picked up a virus there once, back when I used Windows), so more info you can ad to this site is great.
I found this site that identifies a few computers, but obviously there are quite a few more.
http://www.starringthecomputer.com/features.php#MI think the ones used in the base camp tent in "Gold Rush" were Tandy portables, not sure though. I've seen them someplace before, just can't remember where. Also been wondering about the one Mac had in season 7, don't think there's a shot that shows it clearly though. That one could probably run early Windows or even some up to date small versions of Linux, if you felt inclined to actually put it to use.