Alessandro Zummo wrote:

>  Probably most piclisters knows the Morgan Logic Probe..
>  is based on a PIC 12C508 and is able to sense
>  hree-states: 0,1, and high-z...
>
>  The probe is simply connected to one pin

Configured as input.

> and,
>  trough a 100k resistor, to another pin....

configured as output.Now switch output to low level, to high level.
If input follows to output you have hi-z.

>
>
>  How does it works? i.e. how the third state
>  is interpreted?
>
> --
>
>    - *Alex* -
>
>       (azummo@ita.flashnet.it)