Series / 1

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The American Air Force's Strategic Automated Command and Control System for the coordination of the nuclear arsenal based on the IBM Series / 1 (2016)

The IBM Series / 1 computers were 16-bit mini computers introduced in 1976 as a competitor to the PDP-11 from Digital Equipment Corporation and similar devices from Data General and HP . Series / 1 computers were commonly used to control and operate external electromechanical components. There were 2 different operating systems for the Series / 1 : Event Driven Executive (EDX) or Realtime Programming System (RPS). Systems with EDX were mostly programmed using Event Driven Language (EDL), although there were also high-level languages with Fortran IV, PL / 1 , Cobol and Pascal .

The Series / 1 internally used the EBCDIC character coding and locally connected EBCDIC terminals, ASCII- based, remote terminals and devices could be connected to an RS-232 interface via an I / O card .

The production of the IBM Series / 1 computers was discontinued in the late 1980s.

Models

  • Model 2 (IBM 4952)
  • Model 3 (IBM 4953)
  • Model 4 (IBM 4954)
  • Model 5 (IBM 4955)
  • Model 6 (IBM 4956)

Series / 1 applications

8 inch floppy disk drive

Series / 1 computers were used, among other things, in production at General Motors .

The United States Marine Corps was also a major customer for Series / 1. The German Federal Post continued until the late 1980s coverage Series / 1 computer as access computer for the teletext system one.

In 2016, the US Court of Auditors criticized the fact that the Series / 1 used obsolete technology for the " Strategic Automated Command and Control System " (SACCS). The SACCS coordinates the American nuclear arsenal of ICBMs and long-range bombers. As part of the modernization, the 8-inch floppy disk drives were replaced by modern SSDs in 2019 .

Individual evidence

  1. ↑ US nuclear weapons control upgraded from 8-inch disks to SSDs. In: heise.de. Retrieved October 21, 2019 .
  2. ^ Information Technology: Federal Agencies Need to Address Aging Legacy Systems. In: www.gao.gov. Retrieved May 27, 2016 .

Web links