computer

     The computer comes from the Latin which means counting computare. Because the extent of arable fields of computer science, experts and researchers in defining termininologi little different computers.
By Hamacher [1], the computer is an electronic calculating machine quickly and be able to receive digital input, then process it in accordance with programs stored in memory, and produces output in the form of information.
According Blissmer [2], the computer is an electronic device capable of performing multiple tasks as follows:

receive input
input process was in accordance with the program
store the commands and the results of processing
provide output in the form of information
Whereas, Fuori [3] argues that the computer is a data processor which can perform large calculations quickly, including arithmetic and logic operations, without intervention from humans.
To realize the conception of the computer as a data processor for generating an information, it would require a computer system (computer system) which consists of hardware elements, software and brainware. The third element of a computer system must be interconnected and form a unity. Hardware will not work if no software, and vice versa. And both are not useful when there is no human (brainware) who operate and control it.

Hardware : the physical equipment that can be seen and touched.
Software : program containing instructions / commands to perform data processing.
Brainware: people who operate and control the computer system.
 Recent literature on classification of computers classification of computers based on the computer doing tigal things: data processing, use, capacity / size, and generation. Based on the data processed

• Analog computers
• Digital Computer
• Hybrid Computer

 Based on its consumer

1. Computers for Specific Purposes (Special Purpose Computer)
2. For General Purpose Computers (General Purpose Computer)

 Based on the capacity and size

1. Micro Computer (Micro Computer)
2. Computer Mini (Mini Computer)
3. Small computers (Small Computer)
4. Computer Medium (Medium Computer)
5. Large computer (Large Computer)
6. Super Computer (Super Computer)

 Based on the generation

1. First Generation Computers (1946-1959)
2. Second Generation Computers (1959-1964)
3. Third Generation Computers (1964-1970)
4. Fourth Generation Computers (1979-present)
5. Fifth Generation Computer

Sources: www.ilmukomputer.com