There are a number of online keyboard testers that can be used to check if all the keys on your keyboard are working. These websites provide a virtual keyboard on which users can press their physical keyboard keys and see if they appear correctly. KeyboardTester.com is one of the best-known options, with its custom hand-coded testing software which allows users to test each key on their computer keyboard in their own browser. IObit is another popular online keyboard tester that provides users with access to an excellent level of control over the keys they press. Keyboard Checker is another great resource, offering a simple and fast testing process. Finally, Techulator.com offers a list of the best keyboard testers available online, which are all absolutely free.
Citations :
- https://www.keyboardtester.com/
- https://www.keyboardtester.com/#:~:text=KeyboardTester.com&text=Our%20custom%20hand%2Dcoded%20testing,keyboard%20users%20around%20the%20world.
- https://www.iobit.com/en/keyboard-test.php
- https://www.makeuseof.com/windows-laptop-test-keyboard/
- https://keyboardchecker.com/
- https://www.techulator.com/resources/21743-best-keyboard-testers-available-online-absolutely-free
Here you can also find a linux compatible 10 finger writing program
https://www.tipp10.com/en/
Key rollover test?
A key rollover test is used to determine the level of key rollover a keyboard can support. Key rollover is defined as the ability of a computer keyboard to correctly detect input from each key on the keyboard when multiple keys are pressed simultaneously. The key rollover test is used to evaluate the number of simultaneous keypresses that can be registered by the keyboard.
A typical key rollover test involves pressing and holding two or more of the A-Z or 0-9 keys, releasing the shift key, and then pressing all the keys shown in red and orange one at a time to see if all combinations of three or more keys are registered. To make the test easy, various online tools are available to verify the specifications from manufacturers. These tools also provide visual keyboard displays to allow users to try out different key combinations and test how many keys their keyboard can handle at once.
Some keyboards have a two-key rollover, while others have a six-key rollover. Manufacturers may use unconventional counting methods to achieve a higher key rollover value. For example, they may add the combination possibilities of the modifier keys (Ctrl, Alt, Shift, etc.) to the common key rollover count, which does not fit the definition.
For more information, you can refer to the following websites:
https://www.mechanical-keyboard.org/key-rollover-test/
https://csrc.nist.gov/glossary/term/key_rollover
https://www.makeuseof.com/what-is-n-key-rollover-mechanical-keyboards/
http://www.iljitsch.com/2020/keyboardtest/#:~:text=Key%20rollover%20is%20how%20many,or%20more%20keys%20are%20registered.
https://en.wikipedia.org/wiki/Key_rollover
https://www.pcmag.com/encyclopedia/term/n-key-rollover#:~:text=To%20test%20the%20rollover%20number,for%20that%20number%20of%20keys.
Citations :
- http://www.iljitsch.com/2020/keyboardtest/#:~:text=Key%20rollover%20is%20how%20many,or%20more%20keys%20are%20registered.
- https://www.mechanical-keyboard.org/key-rollover-test/
- https://en.wikipedia.org/wiki/Key_rollover
- https://www.pcmag.com/encyclopedia/term/n-key-rollover#:~:text=To%20test%20the%20rollover%20number,for%20that%20number%20of%20keys.
- https://en.wikipedia.org/wiki/Key_rollover#:~:text=Key%20rollover%20is%20the%20ability,keys%20are%20also%20being%20pressed.
- https://actamedicaphilippina.upm.edu.ph/index.php/acta/article/view/46
- https://www.consumerreports.org/cro/2012/02/rollover-101/index.htm
- https://www.makeuseof.com/what-is-n-key-rollover-mechanical-keyboards/
- https://csrc.nist.gov/glossary/term/key_rollover
- https://www.pcmag.com/encyclopedia/term/n-key-rollover
https://www.mechanical-keyboard.org/key-rollover-test/
https://www.mechanical-keyboard.org/n-key-rollover-explained/
A nice page for typing tests online
https://monkeytype.com/