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'AT Keyboards --- Not all equal!'
2000\05\31@175200 by John Hansen

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<x-flowed>You may have been following my problems getting a PIC to read the scan
codes from an AT keyboard over the past couple of days.  Today I brought
home a Gateway 2000 keyboard from the office and it works perfectly with my
code.  This doesn't really solve my problem, of course, in that I still
need to figure out why some keyboards work and some don't.  But at least I
know that the code is doing what it's supposed to do.   For the record the
keyboards tested are as follows:

1. Cherry 84-4100.  That's the board that drops the ones.
2. SIIG Minitouch.  The lights keep flashing when power is applied.
3. Chicony 5161.  Old - has an XT-AT switch.  Lights come on solidly when
power is applied.
4. Gateway 2000 (maybe made by KTC).  Works!

So what we have here is that all keyboards are not created equal!  They all
work with my PC, but they clearly aren't all doing the same thing.  If
anyone runs across an explanation of the differences, I'd love to hear
it.  If I had a digital storage scope, at least I could probably figure out
the difference between the Cherry and the Gateway since they both at least
do something.

John Hansen

</x-flowed>

2000\05\31@180442 by jamesnewton

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2000\05\31@182107 by Erik Reikes

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>So what we have here is that all keyboards are not created equal!  They all
>work with my PC, but they clearly aren't all doing the same thing.  If
>anyone runs across an explanation of the differences, I'd love to hear
>it.  If I had a digital storage scope, at least I could probably figure out
>the difference between the Cherry and the Gateway since they both at least
>do something.

You might look into getting one of those DSO's or logic analyzers that plug
into a parallel port.  I got the logic analyzer from virtual tools
(http://www.virtualtools.com) and for $250 it has saved my bacon countless times.
Its not an HP, but its also not $15k.



>
>John Hansen


Erik Reikes
Senior Software Engineer
Xsilogy, Inc.

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2000\05\31@182732 by Mark Willis

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Feedback.  Terse, this not is.  Long mail, is.  Terser, I desire.

Consider another path,
> Auto-reply.  Far from the path of Proper PIC-i-ness Subject Line
> Topic selection, You stray.
>
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>
> When you fail, will not see your posts! - other list members.
>
> For more, <EraseMEURLspamspamspamBeGonepiclist.com> see.

<G>

 Mark (You folks on the OTList know where I got THAT humor from <G>)

James Newton wrote:
<snip IMO too-large post>

--
I re-ship for small US & overseas businesses, world-wide.
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2000\05\31@211610 by Jim Robertson

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At 05:49 PM 5/31/00 -0400, you wrote:

I had the same problem with different keyboards as you describe.

Some keyboards require the CLOCK period to within tight margins. If I
remember
correctly this is 40us for a full period.

If the clock period is off some keyboards will not work, others will. When
I got the clock right all the keyboards worked 100%

-Jim



{Quote hidden}

Regards,

Jim Robertson
NEWFOUND ELECTRONICS
________________________________________
Email: RemoveMEnewfoundKILLspamspampipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.
________________________________________

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