Josh:

I'm using the DigiTrace software on a Win98 machine and built a circuit
to buffer the input signals to the PC. I used two CD4050 chips driving
the printer port, with inputs driven through 100K resistors to minimize
loading on the test circuit. I've used it maybe a dozen times and it
works great! Let me know off-line & I'll send you a copy of the
schematic. Very simple circuit!

Good luck!
Dennis

Josh Koffman wrote:

>Could you post a schematic for your little buffer when you build it?
>I've been thinking about building one myself, and it would be nice to
>see how someone else approached it.
>
>Thanks,
>
>Josh
>--
>A common mistake that people make when trying to design something
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>        -Douglas Adams
>
>Larry Bradley wrote:
>
>
>>I'm going to hook up an octal buffer as an isolator between the parallel
>>port cable and the PIC pins. The parallel port pins have a 4.7k resistor
>>from +5 to the pin, and a transistor to ground. Thus your circuit  being
>>monitored will have some voltage applied. I stick a 1k resistor in series,
>>which works OK, but I think the buffer is a better idea.
>>
>>
>
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>
>

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