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Persian astronomer Abi Bakr of Isfahan invented a brass astrolabe with a geared calendar movement based on the design of Abū Rayhān al-Bīrūnī's mechanical calendar analog computer. [12] Abi Bakr's geared astrolabe uses a set of gear -wheels and is the oldest surviving complete mechanical geared machine in existence.
The second-generation computer architectures initially varied; they included character-based decimal computers, sign-magnitude decimal computers with a 10-digit word, sign-magnitude binary computers, and ones' complement binary computers, although Philco, RCA, and Honeywell, for example, had some computers that were character-based binary ...
It was a preliminary version of the full ACE, which had been designed by Alan Turing. Aug 1950: US SWAC (Standards Western Automatic Computer) demonstrated at UCLA in Los Angeles; fastest computer in the world until IAS machine. Sep 1950: GER Konrad Zuse leased his Z4 machine to the ETH Zurich for five years. Z4 was a relay-based machine.
So while there is still some potential life for Amdahl's hardware, the transition to 64-bit systems is essentially complete. Some companies and governments still had Amdahl systems performing useful work into mid-2006, and Fujitsu/Amdahl promised support to those customers with replacement parts and other services through March 31, 2009.
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Compiled at the Watson Scientific Computing Laboratory (there is also a 1956 edition) Carter, Ciel (1974). Guide to Reference Sources in the Computer Sciences. Macmillan Information. Charles Babbage Institute (2003). "CBI Software History Bibliography" (PDF) Cortada, James W. (1983).
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