古代及近代讣算技术 公元前504中国,算盘 12世纪, AlKhowarizm,算法 1612, John Napier,对数 162, William Oughtred,计算尺( slide rule) 1642, Blaise pascal,自动进位的加法机器 齿轮驱动的拨盘,在窗口中显示累加和 182, Charles babbage,.分机( differential engine) 单一功能的专用机器 1833解析机( nalytical engine) 具有现代计算机的基本部件→计算机之父 北京大学计算机科学技术系 计算机系统结构教研室
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二十世纪前叶计算技术 1932- Vannevar Bush's mechanical computer(calculus) Late 30's-Zuse, stibitz, aiken electomechanical computer 1937-42-Atanasoff- Berry Computer first electronic digital computer 1943- Turing and Newman-colossus (Decryption) 北京大学计算机科学技术系 计算机系统结枃教硏室
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Electomechanical Computers Limitations Inertia of Moving parts limits computation speed Use of gears and levers etc. to move data is cumbersome and unreliable Equipment bulk Computers with no moving parts 北京大学计算机科学技术系 计算机系统结构教研室
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MIT Differential Analyzer(1930) Curis t he MIT m“ur The MiT differential Analvzer (1930) This room sized machinc was built in 1930 by MIr mathematician Vannevar Bush. The basic computational cngine was mechanical, but the machine used vacuum tubes (then a relativelv new technology) for temporary storage The machine could only solve dif tial equations, so it was not a ge 以 computer in the true serse ot the term The machinEs. pro wears on shats lo program the ma or A specific caluealign, the shat:s and gears mad io be carefuly 北京大学计算机科学技术系 计算机系统结构教研室
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Vannevar Bush's MIT Differential Analyzer (1930) Vannevar Bush, MIT, built a large-scale differential analyzer with the additional capabilities of integration and differentiation, perhaps the largest computational device in the world in 1930 北京大学计算机科学技术系 计算机系统结构教研室
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