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Key rollover (Wikipedia)
Wikipedia, 2026
Read the originalRead on October 16, 2026
- What it is
- The encyclopedia article on key rollover, explaining two-key rollover, N-key rollover and ghosting in keyboard switch matrices.
- How much weight it carries
- Community-edited and referenced. The mechanism it describes is standard keyboard engineering, but the article does not measure how common each rollover type is today.
Facts taken from this source
- Wikipedia says keyboards without isolation diodes can produce ghosting effects when as few as three keys are pressed together.
“pressing as few as three keys can cause ghosting effects” (Key jamming and ghosting)
- Wikipedia says a keyboard with two-key rollover can reliably detect only two keys used at the same time.
“A keyboard with "two-key rollover" can reliably detect only any two keys used simultaneously” (Limited key rollover)