Honeywell 516

Honeywell 516
Name	Honeywell 516
Developer	Honeywell Inc.
Release	1960s
Type	Minicomputer
Cpu	Custom discrete-transistor logic
Memory	Core memory
Successor	Honeywell 6000 series

Honeywell 516 The Honeywell 516 was a mid-1960s minicomputer produced by Honeywell, notable for its compact form factor and use in industrial control, data acquisition, and laboratory automation. It sat alongside contemporaries from DEC, IBM, and Hewlett-Packard, influencing designs used by companies such as General Electric, RCA, and Control Data Corporation. The machine interfaced with peripherals from PerkinElmer, Tektronix, and Mitutoyo and was used in institutions like Bell Labs, NASA, and the United States Air Force.

Overview

The platform was developed during an era defined by innovation at Digital Equipment Corporation, IBM, Hewlett-Packard, Burroughs Corporation, and Control Data Corporation. Engineers from Honeywell collaborated with teams formerly at Bell Labs, RAND Corporation, and MIT Lincoln Laboratory to craft a system optimized for scientific and industrial environments. Marketing targeted operators at NASA Manned Spacecraft Center, Argonne National Laboratory, Sandia National Laboratories, and firms such as Texas Instruments, General Motors, and Ford Motor Company. The 516 competed with models like the PDP-8, DEC PDP-11, IBM System/3, and HP 2116A.

Design and Specifications

The hardware architecture reflected influences from projects at MIT, Stanford Research Institute, University of California, Berkeley, and Caltech. The chassis used modular card cages similar to designs by Raytheon, RCA, and Philco. Core memory modules resembled those used by Honeywell Information Systems and had cycle times comparable to memory in CDC 1604 systems. I/O channels followed practices seen at IBM, UNIVAC, and Burroughs, enabling connections to printers from DEC, plotters from CalComp, and displays from Tektronix.

Physically, the unit occupied floor space typical of minicomputers sold to Bell Laboratories, Lawrence Livermore National Laboratory, and General Electric Research Laboratory. Power supplies and cooling mirrored designs from Westinghouse and Siemens. Components were sourced from vendors including Motorola, Fairchild Semiconductor, Texas Instruments semiconductors, and passive parts from Vishay.

Programming and Instruction Set

Software development drew on paradigms advanced at MIT Artificial Intelligence Laboratory, RAND Corporation, and Carnegie Mellon University. Assemblers and cross-compilers were influenced by tools from Digital Equipment Corporation, IBM Research, and Bell Labs UNIX groups. The instruction set supported operations akin to those in equipment from DEC, RCA, and Burroughs, including fixed-point arithmetic and interrupt-driven I/O inspired by work at NASA Ames Research Center and JPL.

Operating environments resembled lightweight monitor programs seen at MITRE Corporation and batch control systems used by Lawrence Berkeley National Laboratory. Programming workflows adopted practices from languages and systems at Stanford University, Princeton University, and Columbia University research groups.

Peripherals and Interfaces

Peripheral options paralleled offerings used by Hewlett-Packard, DEC, and IBM. Standard interfaces accommodated tape drives from Ampex, disk packs from Memorex, and magnetic drum units similar to those used at NCR Corporation. Analog-to-digital converters were supplied by firms like Keithley Instruments and Fluke Corporation, while digital I/O and relay controls matched industrial standards used by Siemens and Schneider Electric.

Communications supported serial links and protocols interoperable with terminals from Teletype Corporation, networking concepts explored at ARPANET research sites such as University of California, Los Angeles and Stanford Research Institute, and remote telemetry systems used by NOAA and USGS.

Applications and Use Cases

The Honeywell 516 saw deployment in laboratory automation at Salk Institute, Brookhaven National Laboratory, and Oak Ridge National Laboratory; in process control at DuPont, Exxon, and Dow Chemical; and in avionics testbeds at Lockheed and Boeing. Scientific users at Caltech, MIT, and University of Michigan employed it for data logging, control loops, and instrumentation tasks integrating gear from Agilent Technologies and PerkinElmer.

In industrial research, teams from Rolls-Royce, Siemens, and Westinghouse Electric Company used the unit for engine testing and telemetry. Military contractors such as Raytheon and Northrop Grumman adapted it for test instrumentation and simulation in programs involving DARPA and the United States Navy.

Production, Variants, and Legacy

Production occurred during a competitive period alongside machines from Digital Equipment Corporation, IBM, and Hewlett-Packard, with procurement by agencies including NASA, Department of Defense (United States), and national labs. Variants incorporated expanded memory, enhanced I/O, and custom chassis designs for partners such as General Electric and Honeywell Aerospace. The platform influenced later Honeywell lines and concepts that appeared in systems from Unisys and Fujitsu.

Surviving examples are preserved in collections at museums affiliated with Smithsonian Institution, Computer History Museum, and university archives at MIT Museum and National Museum of Computing. Its engineering contributed to practices later adopted by groups at Intel, AMD, and Qualcomm, and informed standards discussed at gatherings of the Institute of Electrical and Electronics Engineers and ACM.

Category:Honeywell computers