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'[EE] AT Keyboards --- Not all equal!'
2000\06\01@083806 by John Hansen

<x-flowed>At 10:58 AM 6/1/00 +1000, you wrote:
>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
>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%

I'm wondering if you would elaborate, Jim.  The clock is generated by the
keyboard.  As long as I read the data after the falling edge of the clock,
shouldn't I be ok?




2000\06\01@204935 by Jim Robertson

At 08:36 AM 6/1/00 -0400, you wrote:

Hi John,

Yes you are right. I was in fact making a "keyboard wedge" and not something
that read the keyboard. This is where I found the timing problem and it
was not with different keyboards, as I first said, rather with different PCs.

Sorry for the bum steer, it was some years ago and I sort of lost the
details in my head.


{Quote hidden}


Jim Robertson
MPLAB compatible PIC programmers.

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