Hi,

I am also interested, could you please give more info on how to access
their BBS.

thanks chaipi

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! Chaipi Wijnbergen                                                           !
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On Mon, 9 Dec 1996, Miller, Steve wrote:

> The January 1997 issue of Electronics Now has a interesting article on
>  using the PC printer port as a logic analyzer.  I have known this was
> possible
> for a long time.  However I never had the time or energy to write the PC
> user interface software.  With the Electronics Now design the software is
> already done and on their BBS.
>
> I have not built the device yet, although I hope to in the next several
> days.
> Because they wanted universal compatibility, they only use the five
> control
> lines as inputs, so five lines can be sampled at once.  The time step in
> the
> article is not directly speced.  Rather it is mentioned that max
> resolution will vary
> based on the speed of the PC running the software.  The range given was
> 0.8uS to 7uS.   Obviously faster is better.  However for much of my
>  microprocessor stuff, I can temporarily slow down the clock, so
>  samples every 1uS would be very useful.  With such a device, I could
> see the interrupt occur on one line, and then have four other lines to
> monitor the PIC's response to the interrupt.  This design auto-calibrates
> itself,
> so that by scrolling forward in time, I can accurately judge how long it
> took to
>  service the interrupt,  how frequently they are arriving etc.
>
> Does anyone have any experience with either this device or printer port
> logic
> analyzers in general?  With a bi-directional printer port and the right
> PC
> software eight traces of data would easily be possible.
>
> If their is any interest in this topic, I will post my results to the
> list.
>
>  --- Steve
>