Interdata 7/32 and 8/32

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The Model 7/32 and Model 8/32 were 32-bit minicomputers developed by Interdata, Inc. of Oceanport, New Jersey during the 1970s. They are primarily remembered for being the first 32-bit minicomputers. The 8/32 was a more powerful machine than the 7/32, with the notable feature of allowing user-programmable microcode to be employed.

After the commercial success of the microcoded, mainframe IBM 360-series of computers, startup companies arrived on the scene to scale microcode technology to the smaller minicomputers. Among these companies were Prime Computer, Microdata, and Interdata. Interdata used microcode to define an architecture that was heavily influenced by, but by no means cloned, the IBM 360 instruction set. The DOS-type real-time serial/multitasking operating system was called OS/32.

The 7/32 and 8/32 became the computers of choice in large scale embedded systems, such as FFT machines used in real-time seismic analysis, CAT scanners, and flight simulator systems. They were also often used as non-IBM peripherals in IBM networks, serving the role of HASP workstations and spooling systems, so called RJE (Remote Job Entry) stations. For example, the computers behind the first Space Shuttle simulator consisted of thirty-six 32-bit minis inputing and/or outputting data to networked mainframe computers (both IBM and Univac), all in real-time. The 8/32 was also employed by Mathematical Applications Group, Inc. (MAGI) to produce the vast majority of the 3D computer-generated imagery (CGI) in the 1982 film Tron. While CGI had been used during the 1970s for minor segments of film work (such as titles), Tron was the first film by a major producer that made extensive use of CGI.

The success of the Interdata 32-bit minis in these markets made the company attractive to Perkin-Elmer Corporation, a large, Norwalk, Connecticut-based scientific instruments and optics manufacturer with a large presence in the defense and aerospace industries. Perkin-Elmer was also a primary competitor of Varian, a company marketing its own computer systems. Interdata was acquired by Perkin-Elmer in 1973, and brought under the corporate name in 1976 as the Computer Systems Division (CSD), one of several divisions in P-E's newly formed Data Systems Group (DSG). In 1985, the DSG was broken apart and the CSD was sold to Concurrent Computer Corporation, who yet produce a vastly enhanced 3200-series of machines.[1]

By 1976, Interdata (Perkin-Elmer) computers were being used by the Architecture Machine Group and Joint Computer Facility at MIT, using the FORTRAN and PL/1 programming languages, but not the Unix operating system. Some are still in use today. Interdata also produced a series of 16-bit based computers, such as their Model 3, Model 4, Model 70, and Model 7/16.

The standard operating system for the 7/32 and 8/32 was Interdata's OS/32. Unix was ported to the platform in 1977 by two groups, working independently; to the 7/32 at Wollongong University, and to the 8/32 at Bell Labs, making the 32-bit Interdata machines the first non-PDP computers to run Unix. (See V6 Unix, portability.)

SIMH, the historical computer simulator project, includes simulators for both the Interdata 32 bit (7/32 and 8/32) and their 16 bit minicomputers.


  1. ^ "Concurrent Computer Corporation History". Retrieved 2011-04-13. 

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