Hewlett-Packard 2114B  
Written by Accutron on 2006-10-10  

The Hewlett-Packard 2114B computer is a size-reduced, cost-reduced descendant of the original HP 2116A minicomputer. Released in 1969, the HP 2114B is a hard-wired word-addressed 16-bit CPU with a derivative PDP-8 architecture. Its technology primarily consists of SSI TTL integrated circuits and magnetic core memory.

The early HP 2100 series computers are regarded as some of the most reliable computers ever built. Systems often ran continuously for years without failure. They also marked the birth of a CPU architecture that would be adapted and utilized in numerous HP computers, calculators and analyzers over the next two decades.

Core Memories: A Photographic History of Early HP Computers
Hewlett-Packard First Generation Computer Census (last update 2016-07-18)

2114B Brochure (PDF)
2114B Price Sheet 06/1970 (PDF)
2114B Price Sheet 05/1971 (PDF)
2114B Volume 1: Specifications and Basic Operation (PDF)
2114B Volume 2: Operation & Maintenance Manual (PDF)
2114B Volume 3: Input/Output System Operation (PDF)
2116 / 2115 / 2114 Absolute Binary Loader Reference Card (PDF)
12618A Synchronous Data Set Interface Kit (PDF)
12539A Time Base Generator Interface Kit (PDF)


2114B, serial number 1105A-00726.


2114B, front panel illumination test.


2114B, card cage configuration.


2114B, A400 Core Memory Stack Assembly, Ampex magnetic core memory, F/N 3255877-01 E S/N FA 106 (4,096 words).


2114B backplane wiring. Despite the hand-wired appearance, early HP minicomputer backplanes were wired by a complex tape-controlled machine, which took only about an hour to complete a 2114 backplane.


02114-60427 Driver/Switch Card, installed in slots A1 and A2.


02114-60429 Inhibit Driver Card, installed in slot A3.


12598-6001 Memory Parity Check with Interrupt Card, installed in slot A5.


02114-6005 Sense Amplifier Card, installed in slot A6.


02114-60424 Arithmetic Logic Card, installed in slots A8, A9, A10 and A11.


02114-60426 Timing Generator Card, installed in slot A12.


02114-60425 Instruction Decoder Card, installed in slot A13.


02114-6003 Shift Logic Card, installed in slot A14.


02114-6041 I/O Control Card, installed in slot A15.


12622-60001 Synchronous Data Set Transmit Card, PCA for the 12618A Synchronous Data Set Interface Kit.


12621-60001 Synchronous Data Set Receive Card, PCA for the 12618A Synchronous Data Set Interface Kit.


12531-60022 Buffered Teleprinter Card, PCA for the 12531C Buffered Teleprinter Interface Kit. At some point during its service life, this card was overclocked to match the operating speed of the 12531D High Speed Terminal Interface Kit. The original 225.280kHz crystal was replaced with a 307.200kHz crystal, increasing its maximum internally generated rate from 1760 baud to 2400 baud.


02116-6119 Time Base Generator Card, PCA for the 12539A Time Base Generator Interface Kit.

HP Computer & Calculator Products (1966-1976)

This article is part of the [Digital Computer Equipment] exhibit.

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