First, the computer work process:
If you want the computer to work, you have to edit out the first procedure, and then save it into the reservoir through an input device that is to execute the following program stored procedure problem. The von Neumann have various designs, the computer should automatically executes the program, and executes the program instructions attributed to the force per row, there are only divided into four operating instructions
An instruction is fetched: the CPU into the interior from the reservoir to an address command for removing the temporary register instruction to be executed
2 Analysis instructions: the instruction stored in the instruction register to the instruction decoder overflow, the operation corresponding to the command
3 executing instructions: a controller according to an instruction issued by the appropriate decoding section, a predetermined instruction to complete the various operations.
4 to prepare for the next instruction fetch the next instruction address of the machine.
Second, the computer system is divided into hardware and software systems
The host system is divided into hardware and external devices.
Host divided into the central processor CPU and memory.
A central processing unit CPU into register arithmetic controller
Memory can be divided into random access memory and a read only memory
Social atmosphere inside the input device and the output device and the external storage and communication devices.
The input device is divided into a keyboard mouse, light pen, scanner.
It is divided into a display output devices, printers, plotters.
External storage tape into a disk, CD-ROM.
A modem card into a communication device
Software system is divided into system software and application software
System software into the operating system and program designer.
Application software is only a variety of applications.
Three, zv understanding of thought and meaning of the data
Today's society is a high-speed development of society, science and technology developed information flow and exchange between people getting closer, more and more convenient life, big data is the product of this high-tech era. Big data is not in, but the content of this excavation and the number of useful value is more important than the fish, large-scale data is the key to win the competition
The value of big data is reflected in the following aspects.
Provide products or services to a large number of consumers, businesses can take advantage of large data precision marketing
You can make use of big data service transformation.
Under pressure must be faced with the transformation of the traditional Internet companies need to advance with the times and take advantage of the value of big data.
Data only impact on the real behavior became information.
The application layer is divided into application layer, the application layer is divided into application layer presentation layer will rule layer
Range transport layer transporting layer is divided into an upper transport
The network layer is divided into a network layer, the network layer is divided into
The network interface layer is divided into circuit data and physical layers
Data circuit layer into the data link layer, the physical layer is divided into a physical layer.
Four switches transport layer is a four routers.
The network layer is a router Layer 3 switch.
The data link layer Ethernet switch is a bridge.
Fourth, the main computer using binary alphabet:
Simple technology
Two binary arithmetic rule simplified and
Suitable logic operation
Easy conversion
Strong anti-jamming capability would represent binary data.
Master binary representation in the computer called this number to calculate the number. I continue to say is signed, with the highest number of a number stored in the computer, positive zero, negative one.
Android mobile phone operating system underlying mission linux Brush is to reinstall the operating system
You can not permanently store data
high speed
In addition disubstituted method will, in addition to two sequentially until the last remainder is zero, then up and down sequentially write each of the remainder to form a new Number
Computer storage device is a solid-state hard-called principle mainly as a permanent memory storage than solid state storage, mainly like a robot arm for rotation of the drive head magnetically read and write operations concerned, ANCD or other solid state storage, you tune zero level or a different recording phase states and a