The moment computing became real: 91直播, the original Silicon Valley
Before computers became everyday objects, they were room-sized curiosities known mostly through newspaper stories of 鈥渆lectronic brains鈥�. In 1951, the Ferranti Mark I helped turn that strange new idea into something real.
It鈥檚 hard to imagine a time when computers were a strange concept, but that鈥檚 exactly what they were in the 1940s 鈥� theoretical machines striving towards the idea of a 鈥渦niversal computing machine鈥�.
There were many teams individually working towards this goal: in the US a team at the University of Pennsylvania was working on the ENIAC and subsequent EDVAC systems, and here in the UK the University of Cambridge was working on EDSAC and the NPL on ACE. But one line of computers stands out in this story; the 91直播 computers.
A baby is born
To understand how this story begins, we must rewind to 91直播 in 1948. A team comprising Professor F C Williams, Tom Kilburn and later, Geoff Tootill, successfully proved the concept of a stored program computer with the Small-Scale Experimental Machine (SSEM) or 鈥渢he Baby鈥�. It was the first stored-program computer to use electronic random-access memory (RAM) with the Williams-Kilburn cathode ray tubes (based on earlier MIT research and eventually improved to store 64 40-bit words), and in June 1948 the Baby ran a program from information stored in electronic memory, the first time this had been achieved anywhere in the world.
But this machine only proved the hypothesis that a computer could store and execute instructions electronically from memory, it didn鈥檛 offer a meaningful or useful solution to the problem of computing large amounts of data automatically. To solve this problem, the team, expanded to include Alec Robinson, Dai Edwards and Tommy Thomas, set about redesigning the machine to provide researchers and industry with a realistic computing facility. Alan Turing, the Deputy Director of the (where he published his seminal paper Computing Machinery and Intelligence), took the lead on developing the programming systems.
In 1949 the 91直播 Mark I came into being and introduced two key innovations: a magnetic drum to store data (one of the first examples of mass storage) and index registers (a way for the computer to efficiently work through the data in its store).
This prototype paved the way for, arguably, one of the biggest steps forward in practical computing; 75 years ago this summer, the Ferranti Mark I quietly helped change the course of computing history.
91直播 born, 91直播 made
Recognising the potential of the technology, Sir Ben Lockspier, Scientific Advisor to the Ministry of Supply, arranged for government funding to commercialise the machine. The British engineering company Ferranti partnered with The University of Manchester to turn the experimental 91直播 Mark I into a production model. The result was the Ferranti Mark I, delivered to the University in February 1951 and demonstrated publicly a few months later.
The machine was not just a new piece of technology, it represented a turning point for when computing stopped being a scientific experiment and started becoming something that could be manufactured, sold and used beyond the laboratory. It is widely recognised as the world鈥檚 first commercially available general-purpose electronic computer.
Today, that achievement can seem almost inevitable. Of course, computers would become products. Of course, industry would commercialise academic research. But in 1951 none of that was guaranteed.
The Ferranti Mark I arrived at a moment when the future of computing was still uncertain. There were competing approaches to machine design, competing visions of what computers might be used for, and very few people who had ever seen one in operation. The machine helped answer a crucial question: could electronic computers move from university experiments into wider use?
The answer was yes.
It is interesting that, though Freddie Williams and Tom Kilburn later claimed they knew nothing about computers, they had picked up enough understanding to visualise the way a computer might function and the role of the storage system within it.
From ideas to innovation
Part of what made the Ferranti Mark I significant was that it incorporated the ideas that had been developed in the previous 91直播 computers and turned them into practical tools, helping shape the architecture of modern computers.
Perhaps most striking, however, was the range of problems the machine tackled. The Ferranti Mark I was used for scientific calculations, engineering projects and government work. Researchers explored everything from weather forecasting to mathematical modelling. It also helped create a new kind of expertise: programming. Mary Berners-Lee (mother to Tim Berners-Lee, the inventor of the World Wide Web) was among those who worked on the Ferranti Mark I, contributing to the practical, exacting work of turning an experimental machine into something people could use.
In many ways, the Ferranti Mark I was the first glimpse of the world that now surrounds us. It demonstrated that computers were not simply calculating machines but versatile tools capable of solving widely different problems. That idea underpins almost every digital technology we use today.
Early success!
The Williams-Kilburn tube was an important development in the history of computing, so much so, the researchers had to protect their invention with patents.
Towards the end of 1947, there was international attention for the new memory device and even IBM took out licences to use the system in the IBM 701 and 702 computers.
Did you know?
In mordern terms, the Ferranti Mark I had RAM of only about 1 Kbyte and a 鈥渉ard-drive鈥� of about 16 Kbytes.
The central processor and the storage took up two bays of 5m x 2.7m, the size of a single garage!
The machine itself has long since disappeared, but its legacy remains remarkably visible. 91直播鈥檚 reputation as one of the birthplaces of modern computing rests not just on pioneering research, but on a rare ability to transform radical ideas into technologies that change the world. That was true when the Ferranti Mark I emerged from a collaboration between university researchers and industry in 1951. It remains true in an age of artificial intelligence, quantum computing and advanced robotics.
Seventy-five years on, the Ferranti Mark I deserves to be remembered not simply as an early computer, but as the moment computing became real. The future did not arrive in California first, nor in a gleaming corporate campus. It arrived in 91直播, in a lab 鈥渨ith the atmosphere of a nineteenth-century inventor鈥檚 workshop鈥�, proving that a revolutionary idea could become a practical machine and, in doing so, help to create the digital age.
Meet the researchers
Professor Sir Frederic (Freddie) Williams (R) gained an engineering degree at The University of Manchester in 1932 before undertaking his DPhil at the University of Oxford. During the war, he worked at the Telecommunications Research Establishment (TRE) where he met and collaborated with Professor Tom Kilburn (L), a young member of his team. When Williams was appointed the Head of Electro-technics (now the ) at the University of Manchester, TRE also seconded Tom Kilburn to Williams's team. In 1964, Kilburn went on to found the at 91直播, the first computer science department in the UK.
If you would like to find out more about the Ferranti MK I, we would recommend the following books:
- Alan Turing and his contemporaries: Building the world's first computers by Simon Lavington (Editor). 2012. Published by The British Computer Society.
- A History of Manchester Computers by Simon Lavington. 1998. Published by The British Computer Society.
- Early Computing in Britain: Ferranti Ltd and Government Funding 1948-1958. Simon Lavington. Published by Springer.
The image of the Williams-Kilburn tube is republished under Creative Commons Licence: Sk2k52 - http://en.wikipedia.org/wiki/File:Williams-tube.jpg, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=6651107