Re: PS/2 mouse as 1351?

From: Greg King (
Date: 2003-09-21 22:55:48

From: Maciej Witkowiak; on Date: Tuesday, September 16, 2003, 07:41 PM
> Now, the only thing missing is the detection of when the SID starts it's
> measuring cycle.  In the document from funet, the POTX line is connected
> to the uC's interrupt-input.  So, when it changes from high to low,
> there is an interrupt triggered.  I tried using it in my design, but it
> failed to work.  There also is this quote from the funet document:
>  "Unfortunately, the POTX signal that was enough for the 16C84 to sense
>  an interrupt-request, is too 'off' for this Schmitt-trigger input :-(.
>  What you see from this is that you can use the 16F84 as a 16C84
>  substitute -- but the interface won't work in native 1351 mode, at all!
>  The same applies, BTW, for the 16CR84 chip."

Am I correct in assuming that "C" means CMOS, and that "F" means "Fast"
(so, the 16F84 is not CMOS)?  What does "CR" mean?

From: Maciej Witkowiak; on Date: Wednesday, September 17, 2003, 07:36 PM
> Today, I tried various configurations of pullups/pulldowns with single-
> and double-inverters; and, it just didn't work most of the time --
> nothing reliable.  It seems that it makes almost no difference if there
> is an inverter or not.

Did you try a CMOS inverter?

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