And probably the only real at-scale deployment of the Western Electric 32000 (Bellmac 32) processor. Sadly that chip wasn't very popular.

As LeoPanthera said above, Bell's exchange for the ability to make PCs was a bit of a bad swap in retrospect. It's pretty easy to see they were going for some kind of convergence of computing and telecoms (the 3B1 has an internal 1200 Baud modem) but they didn't do well on that bet.