Unit1The History of Computer Development(计算机发展史)
TEXT:The History of Computer Development
Early modern computer are typically grouped into four generations.Each generation is marked by improvements in basic technology.These improvements in technology have been extraordinary and each advance has resulted in computers of lower cost,higher speed,greater memory capacity,and smaller size.
First Generation(1945-1959)
The vacuum tube was invented in 1906.And during the first half of the twentieth century,it was the fundametal technology that was used to construct radios,televisions,radar,X-rays machines,and a wide variety of other electronic devices.It is also the primary technology associated with the first generation of computing machines. The first operational electronic general-purpose computer,named the ENIAC(Electronic Numerical Integrator and Computer),was built in 1943(Fig.1-1)and used 18,000 cacuum tubes.……