computer keyboard?

Physically, computer keyboards are an arrangement of rectangular or near-rectangular buttons, or "keys". Keyboards typically have characters engraved or printed on the keys; in most cases, each press of a key corresponds to a single written symbol. However, to produce some symbols requires pressing and holding several keys simultaneously, or in sequence; other keys do not produce any symbol, but instead affect the operation of the computer, or the keyboard itself.

There exist a large number of different arrangements of symbols on keys. These different keyboard layouts arise because different people need easy access to different symbols; typically, this is because they are writing in different languages, but specialized keyboard layouts for mathematics, accounting, and computer programming do exist.

The number of keys on a keyboard generally varies from the standard 101 keys to the 104 windows keyboards all the way up to 130 keys with many programmable keys. There are also compact variants that have fewer than 90 keys. They are normally found in laptops or in desktop computers with space constraints.

The most common arrangements in Western countries are based on the QWERTY layout or closely-related French AZERTY and German QWERTZ variants. The layout of the keys in countries with different alphabets or writing systems, is often similar (e.g. the Thai keyboard layout).

Most modern computer keyboards are based on standard versions with additional keys not normally found on typewriters, such as function keys and a numeric keypad. "Internet keyboards" include extra buttons for user-defined functions such as starting a web browser or e-mail client

The following briefly describes a "dome-switch" keyboard (sometimes misleadingly referred to as a membrane keyboard), the most common type in use today:-

When a key is pressed, it pushes down on a rubber dome sitting beneath the key. A conductive contact on the underside of the dome touches (and hence connects) a pair of conductive lines on the circuit below.

This bridges the gap between them and allows current to flow (i.e. the circuit goes from open to closed), changing the signal strength.

A scanning signal is emitted by the chip along the pairs of lines to all the keys. When the signal in one pair becomes different, the chip generates a "make code" corresponding to the key connected to that pair of lines.

The code generated is sent to the computer either via a keyboard cable (using on-off electrical pulses to represent bits) or over a wireless connection.

A chip inside the computer receives the signal bits and decodes them into the appropriate keypress. The computer then decides what to do on the basis of the key pressed (e.g. display a character on the screen, or perform some action).

Other types of keyboard function in a similar manner, the main differences being how the individual key-switches work. For more detail, refer to the "Keyboard technology" article.

Keys on a computer keyboard

Modifier key

Control key

Shift key

Alt key / Option key (Macintosh)

AltGr key

Command key / Meta key (MIT computer keyboards)

Windows key

Fn key (Compact keyboards)

Dead key

Compose key

Lock key

Scroll lock

Num lock

Caps lock

Navigation keys

Arrow keys

Page Scroll (Page Up / Page Down)

Home key / End key

Edit keys

Return key / Enter key

Backspace

Insert key

Delete key

Tab

SysRq / Print screen

Break key / Pause key

Escape key

Menu key

Space bar

Numpad

Function key

Power management keys

Power key

Sleep key

Wake key

Computer Keyboard and Mouse Commands

The names used the describe commands sometimes differ from manufacturer to manufacturer, although Microsoft Windows has brought about a great deal of standardisation. This page focuses on Windows Applications and there is a separate page for:

etc. etc.

Well keyboard is the way to type your comand as the input to the computer poccess to work.However,If you want to know the location actually it's connecting to the motherboard when you open the CPU.If you want to do setting for the keyboard go to start --> setting --> control panel then click keyboard that for setting so you understand about this.

However,keyboard have different type of port.

PS/2,serial,wireless and more it would be USB also. good luck to you.

Keys, buttons, etc.

Function as an input device.

It consists of a small PCB,Membrane,screws & buttons.

buttons are used as inputs to trigger the pcb which in turn notifies it to the cpu

Go to "start" "programs" "accessories" "accessability" "onscreeen keyboard"

Hope that helps

visit the site

howstuffworks.com

and get answers to all ur similar queries

ctrl is the 'control' key. Now give me my point.