Subject: Re: keyboard input path questions
To: None <tech-kern@NetBSD.org>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
Date: 07/15/2004 16:14:54
>> 1) I hear that that PC keyboards are "scanned" and therefore
>> quantize inter-key timing measurements.
> Every matrix keyboard has to scan, and thus does have some sort of
I'm not sure this is actually true; I think I could probably design a
non-scanned matrix keyboard. (It would be a bit contrived, but I think
it would be doable.)
> Every serially-connected keyboard (or terminal) does this.
To the extent that this is true, it's is a common accident of
implementation, not anything necessary. There's no reason why keyboard
has to be scanned, or even matrix-encoded, just because it's connected
to its host through a serial interface.
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