Why can my keyboard only digest 6 keypresses at a time?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Meditation

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Chapters
00:00 Question
00:35 Accepted answer (Score 90)
01:45 Answer 2 (Score 56)
03:44 Answer 3 (Score 2)
06:12 Answer 4 (Score 2)
07:58 Thank you

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Full question
https://superuser.com/questions/1445219/...

Answer 1 links:
[key rollover]: https://en.wikipedia.org/wiki/Rollover_(...)
[keyboard matrix ghosting]: https://www.google.com/search?

Answer 2 links:
[How does n–key rollover work?]: https://www.youtube.com/watch?
[So how does a PS/2 keyboard interface work?]: https://www.youtube.com/watch?

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Tags
#keyboard

#avk47