The PB 250 (later Raytheon 250[1]) was a general-purpose computer introduced in 1960 by the Packard Bell Corporation.
[4] It had the ability to operate as an I/O processor in tandem with another computer; at the time this was considered a "radically new feature" for a less expensive system.
The computer was intended as a component in special purpose systems,[2] for example, to control electric power plants.
[8] The logic design has similarities with the Bendix G-15 computer, which in turn was based on Alan Turing’s Pilot ACE.
[9][10][11] The circuits were derived from the TRICE[12] digital differential analyzer.