Hi Folks,
                 I've managed to break my previously working  bit banged async
comms
code whilst "improving" it (and trying to cram some more tasks
into the pic ... more of a rewrite really ) .

The project has a pic with an rs232 link to a pc that then puts out commands on
an rs485 bus to
other pic nodes and routes back replies to the rs232.
The rs232 works but now I'm getting no reply back from nodes out on the 485 bus
with the new code (still works with the old code)

My development environment is of the cheap "churn and burn" variety, no ICD but
at least I have ICSP and a scope (non storage).

I'm sitting here at work (day job, supporting IT in insurance .. yawn) wondering
how
to proceed debugging this tonight, ideally I'd like to simulate the code to see
what's going on, otherwise it looks like a long round of putting in led flashes
etc to debug
where the code gets to, or doing a "human pic simulator" act which is somewhat
error
prone in my experience :)

Is there any way I can run two instances of a pic simulator and virtually
connect
the tx and rx pins together as stimuli?

Also can anyone recommend a free "turn your pc with soundcard into a low
bandwidth
(dual input) storage scope good enough for looking at slow (9600) acsync comms"
type program?

Cheers,
             Robin.






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