The Book of the World is digital

The world is a digital reading

after reading "The World is digital" Let me be more surprised, our lives are full of numbers, we live in the digital life, however, some numbers in the simple listen to nothing special, but "the world is Digital" in the book with vivid examples to explain, let me shocked. Educated people have at least the basic knowledge of computers, such as what computers can do, how they do it, what computers can't do, what they can't do right now, how they communicate, what happens during communication, and how computers and communications can affect the world we live in. Perhaps it was not so clear before, but the book should be read.

Below I will briefly summarize the absorption and understanding of the world is digital

One: What's in the computer?

What's in the computer? This problem can be seen in two ways, logically or functionally, namely, what each part is, what to do, how to do it, how to link it, and the physical structure, that is, how each part looks and how it is built. And the debate between PC and Mac has been ongoing, which has led to a series of valuable questions for people to think about.

Two: Logical construction

If you use an abstract image to show what is inside the computer, that is, a logical or functional architecture, is a processor, some main memory, some large memory and a variety of other components, and finally with a set of bus link up between the components to transfer information.

Three: Physical Structure

One of the most important components of a computer electronic circuit is the logic gate circuit, which is used to calculate an output value based on one or two input values, that is, the input voltage or current signal to control the output voltage or current signal. As long as enough gate circuit in the right way to connect, you can perform any computational gate circuit gradually through the tube, transistor era, and now the logic gate circuit is created in the integrated circuit, the integrated circuit in a very thin wafer surface contains all the parts of the board and wiring, It is produced through a series of complex chemical and photochemical processes, so that there is no discrete component and no conventional wiring circuitry. As a result, the circuit of the IC scoring parts is much more reliable.

Four: Moore's theorem

Moore's law was proposed by Gordon Moore, one of Intel's founders. The contents are as follows: When the price is constant, the number of components that can be accommodated on the integrated circuit will increase by one times every 18-24 months, and the performance will be increased by one times. The equivalent of the computer performance that every dollar can buy will be doubled every 18-24 months. This exponential growth is what we call Moore's law.

V: Bits, bytes and information representation

The computer is a digital processor, the computer uses BITS to represent information, and the larger information is represented by a bit group.

Six: Bits, bytes, and binaries

The most basic unit for representing digital information is bits. Today in all modern computers, the basic unit of data processing memory organization is 8 bits, and 8 bits is called a byte. An algorithm used in computing is called a binary, which is a number represented by 0 and 12 numbers. Its base is 2, the rounding rule is "every two in one", the borrow rule is "borrowing one as two", which was found by the 18th century German mathematical philosophy master Leibniz.

Seven: CPU

CPU is the central processing Unit, which has the function of arithmetic and controller. Is the most important one in a computer, so we need to know more about it.

Eight: cache

Cache is small capacity when fast memory, used to store the most recently used information, has avoided access to RAM.

Nine: Other computers

PC, MAC, mobile phone, tablet computer, digital camera with embedded system, camera, GPS navigation system, home appliances, game consoles and so on are all sorts of computers.

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The book also has a lot of knowledge points, feel this book is really particularly suitable for freshman students to read, I will insist on reading more professional knowledge of books, and strive to absorb the knowledge of the book.

The Book of the World is digital