Try
http://www.piclist.com/techref/microchip/picboard.htm

It scans 24 but,... check it out


From: "Tony Harris" <tony@...>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, August 09, 2003 8:59 PM
Subject: Fewer Pin keyboard scanning...?


> A few months ago, there was a short discussion about other methods of
> keyboard scanning,...

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