AT&T 3B2 Minicomputer Emulator

The AT&T 3B2 was a line of UNIX mini- and microcomputers produced in the early 1980s. It was the base porting platform for AT&T UNIX System V Release 3. Unfortunately, AT&T’s entry into the minicomputer world is barely remembered these days. To help preserve this little piece of history, I wrote a 3B2 emulator capable of running unmodified system software directly from disk and tape images.

This project involved a tremendous amount of research, archiving, and reverse engineering to understand the 3B2/400, a popular early model.