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2. Computer keyboard - Wikipedia

   en.wikipedia.org/wiki/Computer_keyboard

   A computer keyboard is a peripheral input device modeled after the typewriter keyboard [1] [2] which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches. Replacing early punched cards and paper tape technology, interaction via teleprinter -style keyboards have been the main input method for computers since ...

3. Keyboard technology - Wikipedia

   en.wikipedia.org/wiki/Keyboard_technology

   The keyboard sends the key code to the keyboard driver running in the main computer; if the main computer is operating, it commands the light to turn on. All the other indicator lights work in a similar way. The keyboard driver also tracks the shift, alt and control state of the keyboard.

4. Computer case screws - Wikipedia

   en.wikipedia.org/wiki/Computer_case_screws

   A regular computer case may require/include [5] 7 thumb screw 6-32 × 6 mm for 2.5” drive tray, expansion slots; 4 hexagon screw 6-32 × 6 mm for psu; 21 phillips screw 6-32 × 5 mm for motherboard, 3.5” harddisk tray; 12 phillips screw M3 × 5 mm for 2.5” harddrive; 16 KB5 x 10 mm for fans; 9 standoff 6-32 × 6.5 + 4 mm for motherboard

5. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   Computer keyboard and monitor mounted on a sliding tray in a rack. The formal standards for a 19-inch (482.6 mm) rack are available from the following: Electronic Industries Alliance EIA-310-D, Cabinets, Racks, Panels, and Associated Equipment, dated September 1992. (Latest Standard Now REV E 1996)

6. Input device - Wikipedia

   en.wikipedia.org/wiki/Input_device

   A common computer input device, a keyboard. A user presses a key which transfers information to a computer. In computing, an input device is a piece of equipment used to provide data and control signals to an information processing system, such as a computer or information appliance.

7. List of keyboard switches - Wikipedia

   en.wikipedia.org/wiki/List_of_keyboard_switches

   Manufacturers frequently build computer keyboards using switches from original equipment manufacturers (OEMs). The switches used determine the feel of the keyboard ...