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The technique of microprogramming as first described by Maurice Wilkes in terms of a second diode matrix added to a diode matrix control store. [2] Later computers used a variety of alternative implementations of the control store, but eventually returned to a diode matrix or transistor matrix.
It was the first book to describe a number of important concepts in programming, including: the first account of a library of reusable code [2]; the first API [4]; the first explanation of using a memory dump for debugging a program, which the book called a "post-mortem routine" [2]
Sir Maurice Vincent Wilkes (26 June 1913 – 29 November 2010 [11]) was an English computer scientist who designed and helped build the Electronic Delay Storage Automatic Calculator (EDSAC), one of the earliest stored program computers, and who invented microprogramming, a method for using stored-program logic to operate the control unit of a central processing unit's circuits.
[citation needed] Maurice Wilkes and a team at Cambridge University executed the first stored program on the EDSAC computer, which used paper tape input–output. Based on ideas from John von Neumann about stored program computers, the EDSAC was the first complete, fully functional von Neumann architecture computer.
The Electronic Delay Storage Automatic Calculator (EDSAC) was an early British computer. [1] Inspired by John von Neumann's seminal First Draft of a Report on the EDVAC, the machine was constructed by Maurice Wilkes and his team at the University of Cambridge Mathematical Laboratory in England.
Various semiconductor diodes. Left: A four-diode bridge rectifier.Next to it is a 1N4148 signal diode.On the far right is a Zener diode.In most diodes, a white or black painted band identifies the cathode into which electrons will flow when the diode is conducting.
The following diode logic gates work in both active-high or active-low logic, however the logical function they implement is different depending on what voltage level is considered active. Switching between active-high and active-low is commonly used to achieve a more efficient logic design.
The Telecommunications Research Establishment (TRE) was also approached for assistance, as was Maurice Wilkes at the University of Cambridge Mathematical Laboratory. [15] The government department responsible for the NPL decided that, of all the work being carried out by the TRE on its behalf, ACE was to be given the top priority. [15]