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2. Computer keyboard - Wikipedia

   en.wikipedia.org/wiki/Computer_keyboard

   Typing on a laptop keyboard. A computer keyboard is a built-in or 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.

3. Numeric keypad - Wikipedia

   en.wikipedia.org/wiki/Numeric_keypad

   For use with a shorter keyboard or laptop which omits the numberpad Bluetooth numeric keypad, working also as calculator A numeric keypad , number pad , numpad , or ten key , [ 1 ] [ 2 ] [ 3 ] is the palm-sized, usually-17-key section of a standard computer keyboard , usually on the far right.

4. Psion MC - Wikipedia

   en.wikipedia.org/wiki/Psion_MC

   Developed by Psion towards the end of the 1980s, informed by market research about the mobile computing needs of potential customers in the 1990s, the MC 400 was introduced in late 1989: an approximately A4-sized laptop or notebook computer featuring a full-size keyboard, 600 x 400 pixel monochrome liquid-crystal display and a multitasking ...

5. Sharp PC-4500 - Wikipedia

   en.wikipedia.org/wiki/Sharp_PC-4500

   The Sharp PC-4500 is a line of laptop computers released by Sharp Corporation in 1987. The line comprises the PC-4501, the PC-4502, and the PC-4521. The PC-4501 is a bare-bones unit with only 256 KB of RAM stock, only one floppy drive, no backlighting, and no built-in numeric keypad; the PC-4502 and PC-4521 bumps the stock RAM to 640 KB and includes the latter two features while providing ...

6. Wireless keyboard - Wikipedia

   en.wikipedia.org/wiki/Wireless_keyboard

   Visual depiction of a compact wireless keyboard. A wireless keyboard is a computer keyboard that allows the user to communicate with computers, tablets, or laptops with the help of radio frequency (RF), such as WiFi and Bluetooth or with infrared (IR) technology. Wireless keyboards in the current market are commonly accompanied by a wireless mouse.

7. TRS-80 Model 100 - Wikipedia

   en.wikipedia.org/wiki/TRS-80_Model_100

   The Tandy 200 has a flip-up 16 line by 40 column display and came with 24 KB RAM which can be expanded to 72 KB (3 banks of 24 KB). Rather than the "button" style keys of the Model 100, its four arrow keys are a cluster of keys of the same size and shape as those comprising the keyboard, though the function and command "keys" are still of the ...