HP 2114A

HP 2114A
Name	HP 2114A
Manufacturer	Hewlett-Packard
Type	Minicomputer
Release date	1966
Discontinued	1971
Predecessor	HP 2116
Successor	HP 2100 series
Memory	4K to 32K words
Storage	Magnetic core memory
Display	Front panel
Input	Paper tape reader
Os	HP Time-Shared BASIC

HP 2114A. The HP 2114A was a 16-bit minicomputer introduced by Hewlett-Packard in 1966 as a cost-reduced version of its successful HP 2116. Designed for instrumentation and laboratory environments, it became a cornerstone for automated test equipment and helped establish Hewlett-Packard's reputation in the computer industry. Its architecture and software influenced the development of the later HP 2100 series.

Overview

Announced in 1966, the HP 2114A emerged during a period of rapid growth in the minicomputer market, competing with systems from Digital Equipment Corporation and Data General. It was engineered specifically to be a dedicated controller within Hewlett-Packard's expanding line of electronic test equipment, such as frequency counters and voltmeters. The computer's design prioritized reliability and direct interfacing with analog-to-digital converters and other laboratory instruments. This focus made it a popular choice in scientific research and industrial automation applications throughout the late 1960s.

Design and features

The HP 2114A utilized a 16-bit word length architecture based on magnetic core memory, with a cycle time of 1.6 microseconds. Its front panel featured an array of toggle switches and indicator lights for direct program entry and debugging. Standard input was handled by an integrated paper tape reader, while output could be directed to a teleprinter or chart recorder. A key innovation was its I/O architecture, which provided a simple, standardized bus for connecting Hewlett-Packard interface cards to external devices like oscilloscopes and signal generators.

The system supported a range of programming languages, including assembly language and FORTRAN, and later could run HP Time-Shared BASIC. Its instruction set included powerful bit manipulation and logical operations useful for instrument control. The design emphasized ruggedness for industrial environments, with a robust power supply and cooling system. These features allowed the 2114A to operate reliably in settings from university laboratories to manufacturing test floors.

Technical specifications

The central processing unit of the HP 2114A operated with a basic machine cycle of 1.6 µs. Standard memory configuration started at 4K words of magnetic core memory, expandable to 32K words. The arithmetic logic unit performed both fixed-point and floating-point arithmetic through software routines. Physical dimensions were consistent with contemporary minicomputer racks, fitting standard 19-inch equipment cabinets.

Input/output was managed through a dedicated I/O channel that could support numerous peripheral devices. Standard interfaces included connections for a high-speed paper tape punch and a line printer. Optional hardware included magnetic tape drives and early disk storage units. The system's power consumption and heat dissipation were significant, requiring dedicated cooling fans and stable AC power sources.

Applications and impact

The primary application of the HP 2114A was in automated test and measurement systems, where it controlled arrays of Hewlett-Packard instruments for tasks like component testing and spectrum analysis. It saw extensive use in aerospace companies like Boeing and Lockheed Corporation, as well as in telecommunications research at Bell Labs. The computer also found a role in academic computing, particularly in physics and engineering departments at institutions like Stanford University.

Its impact was profound in legitimizing the concept of the computer-controlled laboratory, moving measurement science beyond manual operation. The success of the 2114A solidified Hewlett-Packard's transition from an instrumentation company to a major computer manufacturer. It directly paved the way for the HP 2100 series, which dominated the minicomputer market in the 1970s. Furthermore, its architecture influenced early developments in real-time computing for industrial process control.

Variants and related models

The most direct variant was the HP 2114B, which offered minor performance improvements and enhanced I/O capabilities. The closely related HP 2115A and HP 2115B models provided expanded memory and faster processing speeds for more demanding computational tasks. All these models shared a common instruction set and hardware architecture with the original HP 2116.

The technological lineage continued with the HP 2100 series, which incorporated integrated circuit technology and more advanced memory management. Later systems, such as the HP 1000 series, evolved from this foundation. The interface bus concepts pioneered in the 2114A also contributed to the development of the HP Interface Bus, which later became the standardized GPIB used widely in test equipment.

Category:Minicomputers Category:Hewlett-Packard computers Category:1966 introductions