N-Key Rollover and Anti-ghosting for Keyboards as Fast As Possible
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What is N-Key Rollover? Should you disregard all keyboards that don't have it? Keyboard test link: microsoft.com Join Dollar Shave Club: dollarshaveclub.com Dollar Shave Club delivers high quality shaving products and other bathroom supplies to your door every month for less than the cost of buying your razors from the store! Join now and start shaving time and shaving money!
The video opens by clarifying key terminology and laying out the core concept of key rollover. It defines key rollover as the measure of how many keys can be pressed simultaneously and registered by a keyboard, with the maximum being n-key rollover, meaning every key on the keyboard can be pressed at once and all would be registered. The presenter distinguishes ghosting from rollover, explaining that ghosting historically referred to a third key press appearing when two unrelated keys are pressed together, a scenario that is rare on modern keyboards. He notes that anti-ghosting on packaging often refers to weak three-key rollover, typically found on inexpensive membrane or rubber-dome keyboards, and emphasizes that true full-end-key rollover has long been available on PS2 but was limited on USB until more recent developments. The discussion then covers how USB keyboards now commonly support full NKRO, allowing all keys to be pressed simultaneously regardless of the connector, with brands like Ducky and Corsair offering NKRO over USB. The host asks whether NKRO is truly necessary beyond niche scenarios, acknowledging that for most everyday tasks and common gaming, a six-key rollover with four modifiers used to be the practical limit on USB, and invites viewers to share practical use cases in the comments. The segment transitions into practical testing guidance, including a pointer to Microsoft’s online tool for testing a keyboard’s rollover, and wraps by connecting the topic to broader keyboard technology trends, setting up the expectation that NKRO over USB has become more accessible and relevant for enthusiasts. The video also intersperses sponsor content and light commentary, maintaining an approachable, fast-paced tone throughout. The overall takeaway is that NKRO provides the theoretical maximum input capability for keyboards, while real-world needs vary by user, platform, and application, with modern USB keyboards increasingly delivering full NKRO for both gaming and productivity contexts.
Topics · technology · hardware · science · computing
Questions answered
- What is N-key rollover and how does it differ from ghosting?
- N-key rollover is the ability of a keyboard to register every key pressed simultaneously, meaning all keys can be pressed at once and all will be registered by the computer. Ghosting, in contrast, refers to a rare scenario where a third, unrelated key press is mistakenly registered when two keys are pressed together. The video explains that most modern keyboards aim to avoid ghosting, but true NKRO ensures full simultaneous key registration without missed inputs.
- Do USB keyboards support NKRO, and is it necessary for most users?
- Yes, USB keyboards now commonly support NKRO, expanding beyond the older PS2 limitation that often offered only six-key rollover with four modifiers. Whether NKRO is necessary depends on the user; for the average user it may be overkill, but gamers in multiplayer or fast-input contexts, as well as people using keyboards as MIDI instruments or performing rapidChord input, may benefit from NKRO.