AT&T UNIX PC
The 3B1 was a model of small Unix computer originally developed by Convergent_Technologies (later aquired by Unisys), and marketed by AT&T. These machines were loosely referred to as the 'Unix PC, and were initially released in the mid-80's under the moniker 'PC7300'.
Hardware Configuration
- 10MHz 68010 with custom MMU
- demand paged, virtual memory UNIX (max. process size 2.5M)
- 10/20/40/67MB disk
- 512k/1M/2MB RAM
- monochrome, quasi-Hercules display
As marketing strategies changed and basic features were added, the original offering (the PC7300) became known as the 3B1. The 7300 machines featured 512k RAM on the motherboard with a 10 or 20MB disk. The later 7300's featured 1M on the motherboard and a 20MB half-height Miniscribe drive. The later 3B1 machines had 1M or 2M on the motherboard, and came with a 40 or 67MB disk. Accommodating the larger, full-height drives in the 3B1 required that a hump be added to the sloping, wedge-shaped case top. The 3B1 also has a heftier power supply.
Operating System
The operating system is based on UNIX System V Release 2, with extensions from BSD 4.1, BSD 4.2, System V Release 3 and Convergent Technologies. The most recent version is 3.51, with a 3.51m FIXDISK (2.0) available. The FIXDISK was available from AT&T directly, but is now only available on the OSU Archives as FIXDISK2.0+IN.
Resources
comp.sys.3b1 FAQ (The source of much of this information)