HP 2100

HP 2100
Wolfgang Stief from Tittmoning, Germany · CC0 · source
Name	HP 2100
Developer	Hewlett-Packard
Release	1966
Discontinued	1990s
Type	Minicomputer
Cpu	16-bit
Memory	Magnetic core, later semiconductor
Os	RTE, MPE, RT-11 (adaptations)

HP 2100 The HP 2100 was a 16-bit minicomputer family introduced by Hewlett-Packard in 1966, used in scientific, industrial, and commercial applications. It competed with systems from Digital Equipment Corporation, Data General, and Rockwell International and was deployed alongside instrumentation from Tektronix, Agilent Technologies, and Fluke Corporation. The platform influenced embedded computing in organizations such as NASA, USAF, NOAA, and Lockheed Martin.

Introduction

The HP 2100 family emerged during the 1960s minicomputer boom alongside models like the PDP-8, PDP-11, and Data General Nova. Designed by engineers at Hewlett-Packard headquarters in Palo Alto, California, it targeted laboratories and process control installations at institutions including Lawrence Livermore National Laboratory, CERN, and Bell Labs. Sales and support networks involved distributors such as AEA Technology and integrators including Siemens and Honeywell.

Architecture and Hardware

The HP 2100 used a 16-bit word architecture with magnetic core memory early on, later migrating to semiconductor RAM supplied by vendors like Intel and Motorola. Its CPU microarchitecture incorporated registers and an arithmetic logic unit comparable to contemporaries from DEC and General Electric (GE). Packaging employed rack-mounted chassis compatible with standards used by Fisher Controls and instrumentation racks from Schlumberger. Power and thermal designs paralleled equipment from Sun Microsystems lab prototypes and test gear from HP Labs. Manufacturing and PCB assembly intersected with suppliers such as National Semiconductor, Texas Instruments, and RCA.

Instruction Set and Programming

The instruction set provided direct, indirect, and indexed addressing modes similar in intent to sets used by Digital Equipment Corporation but distinct in encoding. Assembly language tools and macro assemblers were produced by Hewlett-Packard and supported integration with compilers influenced by work at Bell Labs and Stanford University. High-level language support included compilers and runtimes for variants of FORTRAN and BASIC used in research centers like MIT and Caltech. Debugging and development workflows incorporated terminals from DEC and Tektronix and remote debugging practices practiced at NASA Jet Propulsion Laboratory.

Operating Systems and Software

Operating environments for the HP 2100 included real-time executive systems developed internally at Hewlett-Packard and bespoke RTOS deployments patterned after systems like RT-11 and research OSes at Carnegie Mellon University. Software toolchains interfaced with laboratory instruments from Agilent Technologies and Edwards Lifesciences and were used in control rooms at European Space Agency facilities. Application software covered data acquisition, control loops, and telemetry that mirrored solutions at McDonnell Douglas and Boeing avionics testbeds.

Peripherals and I/O

Peripherals consisted of teletypewriters from Teletype Corporation, line printers from IBM, magnetic tape units compatible with formats used by Cray Research centers, and disk storage from vendors like CDC and Seagate Technology. I/O subsystems supported analog-to-digital converters and digital-to-analog modules from National Instruments and Honeywell process controllers. Networking and remote I/O implementations resembled early fieldbus and ethernet experiments at Xerox PARC and industrial links used by ABB and Schneider Electric.

Models, Variants, and Evolution

The family evolved through chassis and performance upgrades paralleling roadmaps seen at Digital Equipment Corporation and Data General. Later HP models integrated semiconductor memories and microcoded enhancements influenced by processor research at Stanford University and MIT Lincoln Laboratory. Military and aerospace derivatives were customized for contractors such as Northrop Grumman, Raytheon, and General Dynamics and installed in platforms alongside avionics from Collins Aerospace.

Legacy and Influence

The HP 2100's deployment in laboratories, industrial plants, and aerospace projects contributed to standards and practices later adopted by firms like Intel Corporation, Microsoft Corporation (founders influenced by minicomputer culture), and Sun Microsystems. Its engineering influenced embedded control design at Siemens and ABB and academic curricula at Massachusetts Institute of Technology, Stanford University, and University of California, Berkeley. The platform's role in instrument control and realtime computing presaged developments in embedded operating systems used by Apple Inc. and IBM in later decades.

Category:Minicomputers