Thanks to Travis for recommending Mazemod.

It's mostly tracker-produced music but only the "Chip" category has that "8-Bit sound."
Was pleasantly surprised by the tunes under "Acid" - lots of nice drum and bass and breakbeat stuff with samples* as opposed to square waves, very clean and pure ideas.
It seems to be kids recreating the early '90s (house, 'ardkore rave, early jungle) using software very much at the level of the original gear, but there are surprises--it isn't just nostalgia.
Unfortunately the published playlists are just a small part of the music on the site. You have to page or play through the songs under the categories "Chip," "Bass," and "Acid"; no search function is available and there appear to be hundreds of songs. So if you hear something you like odds are you will never hear it again.

*Disclaimer--Am still getting up to speed on how .mod files work so "samples" is mainly used to distinguish the texture of the sound from raspy videogame blorts--"low res sample data" is probably more accurate. Also, I have no idea when most of the tunes on the mazemod site were actually produced. We discussed at length on my old blog the difference between the tracker scene and old school rave/breakbeat and I still don't entirely understand it.