3B BOF at USENIX (3b4?)

[K. Richard Magill]

In article <117 at aplcen.UUCP> lwt1 at aplcen.UUCP (Lloyd W. Taylor) writes:
>A BOF session for users (and administrators!) of AT&T's line of 3B 
>computers (3B2, 3B4, 3B5, 3B20, ...)

Ok, I'll byte.  What's a 3b4?

xoxorich.
K. Richard Magill