![]() ![]() Note also that not all 2KRO keyboards are equal, as their rollover may be quite different (or optimised towards different expected usages). Note well that this limit doesn’t include modifier keys like Ctrl, Alt, Win or Shift. If a keyboard can register all of its keys being pressed simultaneously, then this is called NKRO. Many inexpensive keyboards have only 2KRO, while higher-end keyboards (and many mechanical keyboards) have 6KRO or higher. For example, 2–key rollover becomes 2KRO. This is often written in its short form KRO. Rollover is quantified as n-key rollover, where n is the minimum number of keys that can be correctly registered when pressed simultaneously. Where one keyboard might be able to handle half a dozen or more inputs, others might struggle to correctly recognise three keys pressed simultaneously. Not all keyboards are created equal when it comes to rollover. How are keyboards classified in terms of rollover? Musical instrument emulation and Plover (a stenotype software) also require many keys to be pressed simultaneously, and therefore require sufficient rollover. When typing slowly, you’re probably typing one key after another, but if you’re writing more quickly or playing a game, it’s very likely that you’ll be holding down, pressing and releasing multiple keys simultaneously. ![]() ![]() Rollover is simply how well your keyboard can correctly register multiple keys being pressed simultaneously. We’ll also give some hints on what you should look for when you’re buying a new keyboard. In this article, we’ll explain what we mean by rollover, how keyboard rollover is classified and show you how to test rollover for yourself. N-key rollover is commonly cited as an advantage of choosing a mechanical keyboard over a rubber dome alternative, but the concept often isn’t well explained. ![]()
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