[Trac #1297] Pressing two adjacent keys at the same time fails

[Zarro Boogs per Child]

#1297: Pressing two adjacent keys at the same time fails
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 Reporter:  cjb        |        Owner:  mlj      
     Type:  defect     |       Status:  closed   
 Priority:  normal     |    Milestone:  Untriaged
Component:  keyboards  |   Resolution:  invalid  
 Keywords:             |  
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Comment (by bert):

 On regular PC keyboards you can press any two, though not necessarily any
 three keys at the same time.  Here's a good explanation
 http://www.dribin.org/dave/keyboard/html/

 So even with a "cheap" grid layout, we should be able to detect two keys.
 Could anyone explain how the "zones" work? Presumably this is done to cut
 down the number of necessary wires, but I could not find any description
 of it.

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Ticket URL: <http://dev.laptop.org/ticket/1297#comment:5>
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