The author is developing an emulator for the AT&T UNIX PC, and it currently boots the 3B1 UNIX operating system. Thanks to the hard work of many individuals, the emulator can run a wide range of software, including the C compiler and MGR windowing system. Serial ports, printer port, and modem are not yet emulated, but the author is looking for solutions. The project wouldn’t be possible without donations and contributions from various individuals, including the generous donation of AT&T UNIX PC systems and software disks by Antoni Sawicki. The web content also includes downloadable resources like boot ROMs, software, documentation, circuit diagrams, and schematics.
https://www.philpem.me.uk/code/3b1emu