Macintosh Computer
Macintosh, also known as MAC, is the Apple (APPLE COMPUTER) produced by the personal computer (PC), use the graphical interface (GUI) operating system (OS) is called (MACOS).

Magnetic disk storage disk storage technology
The world's first hard drive was IBM in 1956 produced 305 RAMAC (The Random Access Method of Accounting and Control).
RAMAC is 50 24 inches in diameter composed of an aluminum plate, aluminum plate coated on both sides of the magnetic oxides, the Golden Gate Bridge from San Francisco, refining of raw materials made of paint. Any user can read both sides of aluminum disk of information stored in 5 million pens.
In 1984, 305RAMAC invention by American Society of Mechanical Engineers International Mechanical Engineering is designated as an important milestone in the history, all current drives are both application and development of this technology has brought.

Mainframe
But the high cost of powerful commercial computing systems, the general size and shape like a refrigerator. Feature is not easy when the machine, and can also perform a variety of computing tasks.
Before 1980A typical mainframe computer environment, as well as by the host to connect directly to the terminal (terminal) formed at the same time, mainframe and other peripheral devices such as printers, etc., are stored in a central focus of the computer room, the "mainframe" is the intent of the alleged storage of central processing unit (CPU) of the main chassis. The earliest mainframe manufacturers including Burroughs, Control Data, GE, Honeywell, IBM, NCR, RCA and Univac, the outside pipe is called "IBM and the Seven Dwarfs"; later GE acquired Honeywell and Univac were; Burroughs and Univac in 1987 integration of Unisys. Also, there are specialized in the manufacture IBM mainframe-compatible models, these companies, including Amdahl, Hitachi Data Systems (HDS), Britain's ICL and Japan's Fujitsu and NEC. In recent years, along with the development of the Internet and personal computers and server performance improvements, the prospects for the mainframe is gradually being questioned. However, the mainframe still has a hard key back of the PC at: RAS, which is the stability (reliability), availability (availability) and to be in degrees (serviceability). RAS is not representative of the mainframe as the PC will crash situation, the mainframe, the average inter-cell failure (MTBF) is 20 years. Currently the only giant IBM, is trying to mainframe move closer to the mainstream market, in addition to continuing in the IBM z Series mainframe by adding new technology and software, and the introduction of new products, are promoting large-scale mainframe openness. For example, IBM mainframe is also actively so that the executable Linux, in order to enhance the attractiveness of its business. At the same time, IBM also working to allow large mainframe to join the network services, it has the "on-demand switching" (on-off capacity on demand).

Macro Programming
Macro, a group of instructions or a collection of keyboard and mouse actions can make a row of some commonly used commands or action with a single macro command to execute.