IBM Series/1

The IBM Series / 1 computers were 16 -bit minicomputer, which were introduced in 1976 as a competitor to the PDP -11 Digital Equipment Corporation and similar devices from Data General and HP. Series/1-Rechner were usually used for the control and operation of external electro-mechanical components.

For the Series / 1 there were 2 different operating systems: Event Driven Executive (EDX ) or Real Time Programming System (RPS ). Systems with EDX were usually programmed using Event Driven Language ( EDL ), although it also gave high-level languages ​​with Fortran IV, PL / 1 and Cobol.

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

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


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

Applications of the Series / 1

Series/1-Rechner were used, inter alia in the production of General Motors. Even the United States Marine Corps was an important customer for Series / 1 The German Federal Post Office continued until the end of the 1980s, coverage Series/1-Computer as access computer for the videotex system.