That approach will get you 80% of the way there - which for a lot of applications is next to useless. The problem is that for a lot of chips there aren't any d

That approach will get you 80% of the way there - which for a lot of applications is next to useless. The problem is that for a lot of chips there aren't any datasheets available. Sure, something like a memory bus is trivial to trace, but how are you going to reason about Unknown Pin #464 coming from Unlabeled IC #4 which seems to randomly have a 500ms pulse on bootup and every few minutes afterwards?