This is why Colossus could not be included in the history of computing hardware for a long time.

History of computing hardware up to third generation (1960s)

Koomey's law describes a long-term trend in the history of computing hardware.

Although it did no computation based on them, it is considered an important step in the history of computing hardware.

For a narrative explaining the overall developments, see the related history of computing hardware and history of computer science.

This article presents a timeline of events in the history of computing hardware: from prehistory until 1949.

See History of computing hardware).

From the early 1900s through the 1960s, mechanical calculators dominated the desktop computing market (see History of computing hardware).

The history of computing hardware in the former Soviet Bloc is somewhat different from that of the Western world.

(see also history of computing hardware)

Moore's law is the observation that, over the history of computing hardware, the number of transistors on integrated circuits doubles approximately every two years.

The history of MML is closely related to the history of computing hardware.

Computers are notable by their absence from works of the human imagination before they were actually developed by scientists in the 1940s, see History of computing hardware.

The history of general purpose CPUs is a continuation of the earlier history of computing hardware.

Development of the Colossus computer by British to break German encryption (see History of computing hardware).

However, Turing-completeness was never considered by Zuse (who had practical applications in mind) and only demonstrated in 1998 (see History of computing hardware).

History of computing hardware: Charles Babbage begins the conceptual design of an "analytical engine", a mechanical forerunner of the modern computer.

The history of computing hardware starting at 1960 is marked by the conversion from vacuum tube to solid state devices such as the transistor and later the integrated circuit.

The earliest programming languages predate the History of computing hardware, and were used to direct the behavior of machines such as Jacquard looms and player pianos.

Thus, Colossus could not be included in the history of computing hardware for many years, and Flowers and his associates also were deprived of the recognition they were due.

June 1 - The United States Census Bureau begins using Herman Hollerith's tabulating machine to record census returns using punched card input, a landmark in the history of computing hardware.

January 8 - In the history of computing hardware, Bell Labs' Complex Number Calculator, a relay-based calculator for complex numbers, is completed under the direction of George Stibitz.

March-December - History of computing hardware: Construction of British prototype Mark I Colossus computer, the world's first totally electronic programmable computing device, to assist in cryptanalysis of German signals at Bletchley Park.

Continued increases in microprocessor capacity have rendered other forms of computers almost completely obsolete (see history of computing hardware), with one or more microprocessors used in everything from the smallest embedded systems and handheld devices to the largest mainframes and supercomputers.

The history of computing is longer than the history of computing hardware and modern computing technology and includes the history of methods intended for pen and paper or for chalk and slate, with or without the aid of tables.