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Maurice Wilkes

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Sir Maurice Vincent Wilkes was a pioneering English computer scientist. He is best known for designing the EDSAC, which was one of the first successful stored-program computers. This type of machine can hold its own instructions in its memory. Wilkes also invented microprogramming, a method to control a computer's circuits using a tiny, specialized program. His work changed how computers are built and how they are programmed. He spent much of his career at the University of Cambridge, where he helped lead the development of modern computing.

Wilkes's journey into computing began with a single document. In 1945, he became the second director of the Cambridge Mathematical Laboratory. While there, a colleague named Leslie Comrie lent him a description of the EDVAC. This was a design for a future computer being developed in the United States. Wilkes read it overnight because he had to return it immediately. The document convinced him that the logical design of machines was the future. In August 1946, he traveled to the United States to attend lectures at the Moore School. During his five-day return voyage to England, he sketched the logical structure for what would become the EDSAC.

The EDSAC, or Electronic Delay Storage Automatic Calculator, was built with a practical mindset. Wilkes did not aim to build the largest or most complex machine. Instead, he used proven methods to ensure the machine would actually work for the university. The EDSAC used mercury delay lines for its memory.

EDSAC (9)
EDSAC (9)

This allowed the machine to store data and instructions internally. It became the second practical stored-program computer to operate successfully, starting in May 1949. This was more than a year before the much larger EDVAC was completed.

In 1951, Wilkes introduced the concept of microprogramming to the scientific world. He realized that the central processing unit, or CPU, could be controlled by a miniature program. This program would live in high-speed ROM, which is a type of permanent memory. This invention greatly simplified the way engineers developed CPU circuits. He first described this idea at a conference in Manchester. Later, he applied this concept to the EDSAC 2. That machine used identical "bit slices" and replaceable tube assemblies to make the design even simpler.

Wilkes also made huge contributions to how humans interact with computers. He is credited with the ideas of symbolic labels, macros, and subroutine libraries. These developments made programming much easier for people. They paved the way for the high-level programming languages used today. He also worked on the Titan computer, a joint project with Ferrisi Ltd starting in 1963. The Titan supported the UK's first time-sharing system. Time-sharing allows many people to use the same computer resources at once. The Titan's operating system even used an early version of password encryption, which was later used by Unix.

Beyond individual machines, Wilkes explored how computers connect to one another. In the late 1960s, he became interested in capability-based computing and worked on the Cambridge CAP. He also investigated a Swiss data network that used a ring topology. This led to the development of the Cambridge Ring network. This technology helped share resources across networks and became widely available in the UK. His interest in distributed computing and multi-user operating systems helped shape the way modern networks function.

Throughout his life, Wilkes received many prestigious honors for his scientific achievements. In 1967, he won the ACM Turing Award, which is a top prize in computer science. He was also a Knight Bachelor, meaning he held the title of "Sir." He served as the first president of the British Computer Society from 1957 to 1960. Many universities, including Newcastle and Cambridge, awarded him honorary doctorates. Even today, the Maurice Wilkes Award is given to young scientists who make great contributions to computer architecture. His legacy lives on in the very structure of the digital world.

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