On This Day - 28th December

John von Neumann is born
1903

John von Neumann is born

A mathematical prodigy, von Neumann went on to make major contributions to mathematics, physics, economics and computing. During and after the Second World War he became one of the most influential figures in the development of the electronic computer.

In 1945, von Neumann wrote the influential First Draft of a Report on the EDVAC, describing a stored-program computer in which both instructions and data could be held in electronic memory. This became a foundation for the computer architecture that would later become known as the von Neumann architecture.

Von Neumann subsequently led the development of the IAS computer at the Institute for Advanced Study in Princeton. Completed in the early 1950s, its design became the model for numerous other computers, including machines such as JOHNNIAC, MANIAC and ILLIAC.

The principle of storing programs and data in the same memory remains fundamental to the architecture of most general-purpose computers.

Image credit: U.S. Department of Energy — Public Domain
Source: Computer History Museum; IEEE Computer Society; MacTutor History of Mathematics.
John von Neumann was born on 28 December 1903 in Budapest, Hungary. He died on 8 February 1957 in Washington, D.C.

Also in this month

Other historical information recorded for December.

1990

ZX Spectrum +3 production discontinued

In December 1990, Amstrad discontinued production of the ZX Spectrum +3, bringing the production run of its disk-based Spectrum to an end after just over three years. The +3 had been introduced in 1987 as the most advanced member of the Spectrum family, combining 128K of RAM with a built-in 3-inch floppy disk drive and support for CP/M.

The decision to discontinue the +3 was reportedly connected with Amstrad's relaunch of its own CPC range. The Spectrum +3 was effectively competing within Amstrad's own home-computer product line, while the simpler +2B was allowed to remain in production because it was considered less of a direct competitor to the CPC machines.

The end of +3 production did not immediately mean the end of the ZX Spectrum. Other Amstrad Spectrum models continued to be produced, with the +2B remaining available until 1992. Nevertheless, the discontinuation of the +3 marked the end of the final disk-based Spectrum model and the beginning of the final chapter of the Spectrum's commercial life.
Source: Sinclair Spectrum historical references
Production of the ZX Spectrum +3 is generally recorded as ending in December 1990. Some contemporary retrospective material gives November 1990, so no exact day is assigned.
Page Revised: 07/09/2026