PB 250 explained

The PB 250 (later Raytheon 250^[1]) was a general-purpose computer introduced in 1960 by the Packard Bell Corporation.

Design

The word size was 22 bits and the memory could be expanded to a maximum of 16,000 words. The performance was 40,000 operations per second.^[2] It had the ability to operate as an processor in tandem with another computer; at the time this was considered a "radically new feature" for a less expensive system.^[2] The Central Computer weighed 110lb.

The design started in November 1959. The computer was intended as a component in special purpose systems, for example, to control electric power plants.^[3] The logic design has similarities with the Bendix G-15 computer, which in turn was based on Alan Turing’s Pilot ACE.^[4] The circuits were derived from the TRICE^[5] digital differential analyzer.^[6]

People involved in development:

• Max Palevsky – general manager, started the development process.^[7]
• Stanley Frankel – consultant on the design of the computer logic
• Robert Beck – designer of the computer logic^[8]
• Smil Ruhman – circuit design
• Jack Mitchell and Donald Cooper – management and coordination of the overall engineering project

Features

The PB250 used a Flexowriter as a console.

It could be operated entirely from a battery power supply.^{[9] [10]}

Software

• SNAP I (Symbolic Non-optimizing Assembly Program) assembler
• ATRAN (Algebraic TRANslator), process oriented language
• CINCH Interpreter, a floating point interpretive system, designed to permit rapid programming of scientific and engineering problems.
• OUP III (Octal Utility Package III) which "allowed the operator to perform certain transfer functions, printout locations of memory, store single words into memory, and begin the execution of programs that had been stored in memory."
• NELIAC compiler
• Fortran II^[11]

Uses

• By WANEF (Westinghouse Astronuclear Experiment Facility), whose task was to perform basic research and reactor analysis on the NRX series of nuclear reactors to be used in nuclear rocket engine.^[12]
• In the Saturn 1 first stage checkout.
• In TRICE models TC5108/250 and TC5036/250^[13] hybrid computers.
• In Hycomp 250 hybrid computer, later replaced by PB440.^[14]
• In nuclear submarine training systems^[15] and in antisubmarine warfare trainers.^[16]
• PB 250 was licensed to SETI (fr|{{ill|Société européenne de traitement de l'information|fr).^[17] It could be connected to the SETI 2000 process control system.
• In mobile (by van) monitoring and data processing services.^{[18] [19] [20]}

Bibliography

• Beck . Robert Mark . PB-250 – A High Speed Serial General Purpose Computer Using Magnetostrictive Delay Line Storage . International Workshop on Managing Requirements Knowledge (AFIPS) . 283 . 30 December 1960 . 10.1109/afips.1960.58 . en . The first production computer was delivered in October 1960..
• The PB 250 General Purpose Digital Computer . Computers and Automation . August 1960 . 9 . 8 . 1B–3B (9–11) . . ... was introduced by Packard Bell Computer Corporation at the Western Joint Computer Conference in May.
• Web site: PB-250 documents . www.bitsavers.org. .
• PB 250 . AUERBACH Standard EDP Reports . 7 . 165–251 . .
• Descriptions of Digital Computers . Computers and Automation . June 1963 . XII . 6 . 72, 82 . .
• A Survey of New West-European Digital Computers (Part 1): France . Computers and Automation . September 1963 . XII . 9 . 23 . .
• Book: Kaisler . Stephen H. . Birthing the Computer: From Drums to Cores . 2017 . Cambridge Scholars Publishing . 978-1-4438-9625-2 . 304–317 . https://books.google.com/books?id=P10pDwAAQBAJ&q=%22PB250%22&pg=PA304 . en . Chapter Thirteen – Packard Bell.

External links

• the pb250 ad. Computers and Automation. Jun 1960. 9. 6. 76. 2020-09-05.
• Web site: The PB-250 . www.cca.org.
• Web site: The Retro-Computing Society of RI, Inc. . www.rcsri.org.

Notes and References

1. Funderburk. B. J.. 1 Jan 1968. Automation in Saturn 1 first stage checkout. 3, 6.
2. . Packard Bell Computer Corporation, PB250 . Digital Computer Newsletter . Office of Naval Research . July 1960 . 12 . 3 . 6–7 . 1 June 2022.
3. News: . Packard Bell, Bailey Meter Sign Agreement . Los Angeles Times . Los Angeles . April 15, 1960 . Max Palevsky, Packard Bell Computer vice president, said power plants in the electric industry provide one of the most promising markets for digital computers..
4. Web site: ((Smithsonian Lemelson Center)) . Computer Oral History Collection, 1969–1973, 1977: Harry Huskey and Mrs. Huskey . Lemelson Center for the Study of Invention and Innovation . en . 23 July 2014. AC0196_husk730419.pdf, pp. 15, 17, 19, 24.
5. Web site: TRICE. Weik. Martin H.. Jan 1964. ed-thelen.org. A Fourth Survey of Domestic Electronic Digital Computing Systems.
6. Web site: PACKARD BELL 250. Weik. Martin H.. Mar 1961. ed-thelen.org. A Third Survey of Domestic Electronic Digital Computing Systems. For applications where power failures and resultant loss of memory cannot be tolerated a battery power supply is available which will operate the computer for several hours without line power..
7. Web site: Computer Oral History Collection, 1969–1973, 1977: Max Palevsky. ((Smithsonian Lemelson Center)). 23 July 2014. Lemelson Center for the Study of Invention and Innovation. AC0196_pale730215.pdf, pp. 4-5, 10-11. en.
8. Book: Palevsky, Max oral history 102657969 Computer History Museum. www.computerhistory.org. 29 August 2006 . 11, 14, 19. Computer History Museum . en.
9. Electronic Operations . Electronics Industries . Feb 1961 . 2 . 199 . A battery-operated electronic computer, PB 250, has been shown by Packard Bell Computer Div., Packard Bell Electronics. In normal operation, it operates from a battery trickle charged from a 115-v. power line. If 115-v. input is interrupted, computer can continue operating for more than 1 hr..
10. Feb 1961. BATTERY OPERATED COMPUTER. Computers and Automation. 10. 2. 1B (17). For the first time, we believe, an electronic computer can operate entirely from a battery power supply.. 2020-09-05.
    • Elliot 802 was an earlier computer with a battery:
      • Web site: Elliott 800 series and 503: 1957 onwards – Systems Architecture. www.ourcomputerheritage.org. 2, 4.
11. Book: Fortran II for the Raytheon 250 Computer. en.
12. Beene . J. L. . Rankin . W.D. . Reactor experimentation and the Packard-Bell computer . 1 October 1964 . 10.2172/4228429 . Office of Scientific and Technical Information (OSTI). 108792184 . Submitted manuscript .
13. Book: Programming manual for TRICE and other material on DDA's 2nd edition 102664334 . Computer History Museum . 3 May 1960 . Packard Bell Electronics. Packard Bell Computer . en.
14. Web site: Computer History Museum . HYCOMP 250—The first desk top hybrid analog/digital computing system . en . 1961 . Packard Bell Computer.
15. "Across the editor's desk": Computer and Data Processing Newsletter . Sperry orders two nuclear sub training systems . Computers and Automation. May 1963. XII. 5. 44. 2020-09-05.
16. Advances in Instrumentation: Proceedings of the ISA International Conference and Exhibit . 1983 . 38 . 1 . 244 . Instrument Society of America . 9780876647806 . en.
17. Web site: SETI Calculateur PB 250. Nieuwbourg. Philippe. Le blog de l'actualité du musée de l'informatique. fr. SETI Calculator PB 250.
18. Book: Control Engineering . 1961 . Technical Publishing Company . 29 . https://books.google.com/books?id=0O1IAQAAIAAJ&q=%22pb+250%22+computer+%22mobile+system%22 . en. 8. 1. Chemical Plant Puts Computer on Wheels.
19. Book: Business Automation . 1962 . Hitchcock Publishing Company . 48 . en. 8.
20. July 1962. "Across the editor's desk": New Firms, Divisions, and Mergers . On-call data vans for hire . Computers and Automation. XI. 7. 28. 2020-09-05.