From mboxrd@z Thu Jan 1 00:00:00 1970 From: dmr@plan9.bell-labs.com (dmr@plan9.bell-labs.com) Date: Mon, 20 Feb 2006 23:16:49 -0500 Subject: [TUHS] re: ATT 3b2 Message-ID: > I'm interested in acquring an AT&T 3b2 computer. One of these systems > used to run a famous public UNIX system "killer". They also run #5ess > telephone switches, however the OS is different in that case > (DMERT/UNIX-RTR instead of whatever the consumer-level 3b2 runs). > If anyone has information on where to acquire these (I saw the recent > discussion on 3b1s and I know they are more prolific than 3b2s-- infact > a friend of mine used to have a UNIX PC which we set up a BBS on). The 3B2 was not the same machine as the one in 5ESS, which was/is the 3B20D, a fairly large duplexed machine (two processors that mutually checked each other). The 3B2 was a desktop. The 3B20D wasn't sold commercially, as far as I know. There was a 3B20S (multi-cabinet) that at least nominally was commercially available. Their ISAs were not quite the same, but some assembler language tricks made the assembler-level languages look quite similar. Dennis