Submitted by: Submitted by th337
Views: 532
Words: 1968
Pages: 8
Category: Business and Industry
Date Submitted: 04/06/2011 04:05 PM
Introduction
Because computers are widely used nowadays, the peripheral equipment of computers also has great development. No matter loudspeaker boxes, mouse, printers or keyboards, all of these facilities are bring convenience and happiness to our life. Although the application of mouse is increasing, the keyboard is still very important in the text entry field. Since people began to develop computers, the keyboard always plays a key role in the development of the computer. Generally, there are three kinds of keyboard; they are the keyboard of desktop, the keyboard of laptop and the keyboard of IPC (Industrial Process Control). This article is focus on the keyboard of laptop. First, a brief history of keyboard revolution will be described. Secondly, the Previous evolution of keyboard and the current evolution of keyboard will be shown, meanwhile, this article will explain why some innovations of keyboard are failed and some developments of keyboard are succeed.
A brief history of keyboard revolution
Firstly, let us review the history of keyboard for PC. With the IBM published the IBM-PC and PC/XT officially in 1981, the first personal computer keyboard appeared. The first personal computer keyboard is a small keyboard which only has 83 keys, this keyboard could be called XT keyboard. The initial design of this keyboard was unidirectional. That means XT keyboard only could send data to the host machine, but cannot receive data from the host machine.
Figure 1, the XT keyboard
Then, with the IBM PC/AT was published, IBM developed an entail new keyboard quickly in 1984. This kind of keyboard could be called AT keyboard. The AT means “Advanced Technology”. This kind of keyboard has 101 keys, and people are familiar with this design. Comparing the XT keyboard, there are two differences between the XT keyboard and the AT keyboard. First, the AT keyboard not only could send data to the host machine, but also could receive data from the host machine. There...