Google Groups is where all those newsgroups are accessible now. I'm sure you can use other clients as well, but GG seems very convenient!
You can find the original thread here: https://groups.google.com/forum/#!topic/comp.os.minix/wlhw16...
You can find the original thread here: https://groups.google.com/forum/#!topic/comp.os.minix/wlhw16...
Google Groups is decent for searching old Usenet posts (though they've removed the "Advanced Search" feature), but horrible for posting. There are a number of NNTP clients (including Firefox) and free or cheap servers (I use news.eternal-september.org).
(To be clear, Google Groups includes both an interface to Usenet newsgroups and Google's own non-Usenet groups. It's probably ok for the latter, but they seriously botched the Usenet interface.)
Unless everyone is still using newsgroups for something besides piracy which is the only time I've really heard them used in a modern context.
I don't think newsgroups are only used for piracy. Most open source products have a Google Group associated with it unless they're using the discussion on Github or Stackoverflow chat / IRC.