[simpits-tech] Small CRTs (Was: Just a quick update.........)

[Gene Buckle]

On Fri, 13 Apr 2012, Cris Harrison wrote:

> On 4/13/2012 10:25 AM, Gene Buckle wrote:
>> On Thu, 12 Apr 2012, dabigboy at cox.net wrote:
>>
>>> ---- Gene Buckle<geneb at deltasoft.com>  wrote:
>>>> Just be aware that a pc keyboard does not use a diode isolated switch
>>>> matrix, so you'll only be able to hold 3 or 4 "keys" down at once before
>>>> the keyboard stops responding to inputs.
>>> Yep, I'd noticed that. That's why I've only ever considered it for the
>>> FMS or another keypad'ish task, where I will probably never be pressing
>>> more than one button at a time.
>>>
>> You can add diodes yourself like so:
>> http://www.geneb.org/ematrix.png
>>
>> This is for the EPIC input matrix, but it would be essentially the same
>> schematic for hacking a keyboard matrix.  Once you identify the row&
>> column lines it's easy.
>>
>> Alternately, you could just grab an Arduino and a Centipede Shield and
>> skip the whole keyboard mess to begin with. :)
>>
>> g.
>>
>>
> gene.. I like your position but its a white herring.. On most avionics

I would strongly suggest you not try to teach your grandmother how to 
steal sheep.

g.

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