A Common Keyboard Layout
| Keyboard Layout | |
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A keyboards layout determines which ASCII (or ASCII equivalent) codes are associated inside the computer with which physical keystrokes or keyboards events. The keyboards layout that is typically printed on the keys of computer keyboard is Standard 101. You can change the layout as a Setup option in most modern computer systems. Some people use the Dvorak layout because they find it easier. Other layouts are appropriate for non-Latin alphabets. Most people stick with one layout and use different mappings for different purposes. Most keyboards can sense several keys being pressed simultaneously so that, for example, a Shift key can be used to double the number of codes. In this case, one keyboards event consists of several signals. However, if you are interested in simulated six-key typing, you've probably discovered that although most keyboards recognize up to three simultaneous keystrokes, only a few can recognize six keys being pressed simultaneously. Filter keys adjust the speed at which letters appear when letter keys are pressed. Slowing down the repeat rate eliminates the duplication of letters for typists with shaky hands. |
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The most common keyboard connectors are: |
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| PIN out for keyboard connectors | ||
| Description | 6-pin (PS/2) | 5-pin (DIN) |
| Keyboards Data | 1 | 2 |
| Not Used | 2 | 3 |
| Ground | 3 | 4 |
| Current (+5 volts) | 4 | 5 |
| Keyboards clock | 5 | 1 |
| Not Used | 6 | - |
Avoiding carpal tunnel syndrome: A guide for computer keyboard users.
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