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Re: N-key rollover keyboards (was: issue with keyboard input for multipl

From: Dmitry Alexandrov
Subject: Re: N-key rollover keyboards (was: issue with keyboard input for multiple keys Ctrl-b / nkey rollover?)
Date: Sun, 02 Aug 2020 20:04:48 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Yuri Khan <> wrote:
> On Sun, 2 Aug 2020 at 18:00, Alan Davis <> wrote:
>> I hoped the Nkey rollover would mean key chords like Ctrl-b would work.

> N-key rollover does not matter at all. Modifier keys (Ctrl, Alt, Shift
> and whatever OS-specific fourth key you use) are always reported
> independently in the USB HID keyboard protocol.

FWIW, N-key rollover is not really about USB or protocols; itʼs about circuit 
of the keyboard.

It does matter, when you reconfigure modifiers in a human-friendly way, that is 
move one of the ‘controls’ (normally, the left one) closer to ‘space’ — under 
your thumb — (ctrl:swap_lalt_lctl setxkbmap(1) -option or equivalent).

Then, on many ordinary keyboards few combinations, that are in use in Emacs, 
are indeed get ‘ghosted’.  And M-C-b with inner M- and C- is a very likely 

Two-key chords can never be affected, of course.

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