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In the UK, the National Museum of Computing Bletchley Park has returned to service one of the oldest computers in the world created in 1949. Dismantled decades ago, this electromechanical device, which used curious gas lamps, has been restored for three years. It works. But count a dozen seconds to multiply two numbers ...
It is a forerunner of the computer that woke up after a sleep of nearly forty years. It is called Witch, weighs 2.5 tons, 2 meters high and 6 meters wide, consumes 1.5 kilowatts of electricity, and was built in 1949, making it one of the first computers in the world. Display at the National Museum of Computing Bletchley Park (UK), this behemoth was restarted last week after three years of restoration.
Initially, the machine is called the Dekatron wedding invitation Harwell. She started for the first time in 1951 and was one of a dozen computers in the world. Between 1952 and 1957, Dekatron was used for basic nuclear research center at Harwell atomic research. He was then transferred to the University of Wolverhampton where he traded his name for Wolverhampton Instrument for Teaching Computing from Harwell (Witch). He used to teach computer science students. Between 1973 and 1997, it was stored in a museum in Birmingham, to finally fall into oblivion, dismantled in a warehouse. The Witch was rediscovered in 2009. He has since been restored to its original panache.
In this video, the Dekatron Harwell (aka Witch) 39 restarts after shutdown. One can see flash gas tubes Dekatron http://tubehobby.com/show_det.php?det=17 temporarily store data. The machine also included 480 and 7073 relay electromechanical circuits. The National Museum of Computing Dekatron as fast as humans, but more enduring
To function, the Dekatron (aka Witch) ingurgitait data in its random from punched tape memory. This memory employed relays to perform calculations. At the exit, the results were printed on a typewriter or electromechanical stored perforating strips.
Conceived before the arrival of the first transistor, the Witch uses 828 gas tubes Dekatron to store data and load programs. Also called the decimal counting tube, this type of electronic tube was then used as a counter for calculating machines, especially in the nuclear as particle counter. With these Dekatron, treatments are performed in decimal, binary and not as purely electronic computers that followed. wedding invitation
Witch was not swift: he needed 5 to 10 seconds to multiply two numbers. Therefore very slow, but enduring. It was designed to overcome the shortcomings wedding invitation of the human being, which is not capable of performing calculations for 24 hours. Independent and reliable, and he could stay for days running without any intervention. Jack Howlett (1912-1999), a pioneer wedding invitation of the computer wedding invitation that used the Witch in the 1950s, said that he remembered holiday season during which the machine had swallowed and processed kilometer data autonomously for ten days without any worry.
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