History of the development of a computer
Calculator: tool for human calculate and store data.
Early human use knots notes, thinking. These early calculation tool in the data storage and computation efficiency is not ideal.
The first generation calculator 14 February 1946 the University of Pennsylvania was born, invented by the Americans Moke Li and Eckert.
As the world's first calculator, big is it most important characteristic is large, it is composed of 18,000 tubes, covering 150 square meters and weighed 30 tons. This is because at that time due to the level of the industrial base, the tube can not do the same as they are now. (Calculator thyristors as switching, by turning off the thyristor OFF is 0, a is closed, as a machine language for a computer CPU, high-low '0' and '1', the significance is not strictly high and low, there are high and low voltage threshold range)
The second computer basics
The basic composition of 2.1) of the computer: a controller, the arithmetic unit, memory, input devices, output devices.
1) Controller: control system of a computer
2) operator: computing system of a computer
Controller and operator of the computer CPU constituting the two parts.
3) Memory: memory is divided into memory and external memory. Operating characteristics of memory are closely rely on electricity to work, fast read speed, but after disconnecting the power will clear the data. The operating characteristics of the external memory read speed, although slow, but can be stored permanently.
4) The input device: a common input device has a keyboard, mouse, touchpad and the like.
5) an output device: a common output device display, digital control, LED matrix display
2.2) computer system
Applications, operating systems, computer hardware: 1) computer system in part by three major components
Computer hardware (the five basic components of a computer)
The operating system is based on computer hardware applications. Such as the common Android , iOS , Linux , Windows , Mac the X-OS
Applications written for our desktop application, all applications.
2) The computer system can be divided into the hardware and software components
Computer hardware components: an external host apparatus and
1, there are a host central processing unit CPU and memory components. The central processor by the controller, the operator, and registers. Memory is a read only memory ROM and a random access memory RAM two kinds of configuration.
2, the external device has an input device, an output device, an external storage device and a communication device.
Computer software components: system software and application software
System Software: Android , iOS , Linux , Windows , Mac the X-OS