Microcomputer is generally divided into 4-bit, 8-bit, 16-bit, 32-bit and 64-bit machine

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According to the microprocessor (CPU) Word length classification by the microprocessor, the microcomputer is generally divided into 4-bit, 8-bit, 16-bit, 32-bit and 64-bit machine.

(1) 4-bit microcomputer; 4-bit word-length microprocessor is a CPU, its data bus width is 4 bits, and one byte is divided two times to transmit or process. The 4-bit machine instruction system is simple, the Operation function is single, mainly uses in the pocket or the desk calculator, the home appliance, the entertainment product and the simple process control, is the microcomputer's low-level stage.

(2) 8-bit microcomputer: 8-bit-length microprocessor for CPU, its data bus width of 8 bits. The word length and byte in a 8-bit machine are the same concept. When the 8-bit microprocessor is introduced, the microcomputer is mature in hardware and software technology. So the 8-bit machine instruction system is comparatively perfect, the addressing ability is strong, the periphery supporting circuit complete, thus makes the 8-bit machine versatility, the application is broad, is widely used in the transaction management, the industrial production process automatic detection and control, the communication, the intelligent terminal, Education and home appliances control and other fields.

(3) 16-bit microcomputer: with high-performance 16-bit microprocessor for CPU, data bus width of 16 bits. As the 16-bit microprocessor not only in the integration and processing speed, data bus width, internal structure and other aspects than 8-bit machine is essentially different, by their composition of the microcomputer in the function and performance has basically reached the level of the mid-range minicomputer at that time, especially with the Intel 8086 CPU 16-bit microcomputer IBM PC/XT is not only a considerable period of time in the mainstream models, and the amount of its user ownership is the world's first, even in the design of higher-grade computer, should maintain his compatibility. The 16-bit machine plays an important role in the computer network besides the original application field.

(4) 32-bit microcomputer: 32-bit microcomputer using 32-bit microprocessor for CPU, this is the current mainstream model. From the application point of view, 32-bit length is ideal, it can meet the most of the needs of the use, including text, graphics, table processing and precision scientific calculation, and other needs. Typical products are Intel 80386,intel 80486,mc68020,mc68030, Z-80000, etc. In particular, the 1993 Intel company launched the Pentium microprocessor, the 32-bit microprocessor technology into a new phase. He not only inherited all the advantages of his predecessors but also has a new breakthrough in many aspects, while satisfying people's increasingly urgent needs in the fields of graphic images, real-time video processing, language recognition, large flow client/server applications, etc.

(5) 64-bit microcomputer: 64-bit microcomputer uses 64-bit microprocessor as CPU, which is the newest product developed by every computer leading company. In fact, high-end microprocessors already have 64-bit word length of the product. It is too expensive to use for microcomputers and is usually used on workstations or servers. Now it's time to get 64 microprocessors into the field of microcomputers. It is estimated that Intel and HP will launch their first 64-bit microprocessor for microcomputers in 2003. Believe that a 64-bit microprocessor will push a microcomputer to a new stage

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4004 is 4-bit.
8086 8088 is 8-bit.
80286 80287 is 16-bit.
From the 80386-Pentium 4 era are 32-bit
Pentium D and ALTHON64 are 64-bit

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16-bit, 32-bit, 64-bit, what do you mean?

Refers to the computer internal processing data of the number of bits, the higher the number of digits, CPU processing data capacity is stronger.

The computer language is described by the binary. That is to say, when a computer identifies a message, it recognizes only the two numbers 0 and 1.

The eight-bit binary number is the most basic computer language, and a eight-bit binary number is a byte. For example: 00001111, 10000110, 11011000, respectively, on behalf of different information.

After 8 digits, the next step is 16-bit, 32-bit, and 64-bit. Represents the ability of a computer to identify and process data and information.

Windows is a 32-bit operating system and DOS is 16-bit. 386 is the first 32-bit processor.
The 16-bit and 32-bit of the operating system is defined according to the address method it uses and the number of registers. With 32-bit and 16-bit CPU and so does not have much relationship, of course 32-bit operating system will certainly need 32-bit CPU support.