Computer in Quantum science: Vol. 1 by Sunil Kumar Barle

Author:Sunil Kumar Barle [Barle, Sunil Kumar]
Language: eng
Format: azw3
Publisher: UNKNOWN
Published: 2018-11-25T16:00:00+00:00

Microprogramming

In 1951, British scientist Maurice Wilkes developed the concept of microprogramming from the realisation that the central processing unit of a computer could be controlled by a miniature, highly specialised computer program in high-speed ROM. Microprogramming allows the base instruction set to be

defined or extended by built-in programs (now called firmware or microcode).[114] This concept greatly simplified CPU development. He first described this at the University of Manchester Computer Inaugural Conference in 1951, then published in expanded form in IEEE Spectrum in 1955.

It was widely used in the CPUs and floating-point units of mainframe and other computers; it was implemented for the first time in EDSAC 2,[115] which also used multiple identical "bit slices" to simplify design. Interchangeable, replaceable tube assemblies were used for each bit of the processor[116]

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