Which way is the data going? (probably a dum question)

[egr]

When dealing with "data cut" type bends and not audio, is there a way I could easily tell which way the data is going?  Maybe a better way to say that would be:  BEFORE any traces are cut how can I tell where the data is originating (assume I have no info on chips whatsoever)

Not sure that makes sense 
Thanks!

[kick52]

Use an LED to test? They only work one way.

[egr]

Use an LED to test? They only work one way.

Sweet!  I'll try that!

[kick52]

Fast response!
That must have been in under a minute.

[egr]

   I tend to lurk during buisness hours...

[Gordonjcp]

That will only tell you if a line is active - although if you cut the trace you'll find the "upstream" side goes on and off

[egr]

That will only tell you if a line is active - although if you cut the trace you'll find the "upstream" side goes on and off

Got it!  Thanks!

[computer at sea]

There's a nice circuit out there that someone made for a PSR-6 with the data cut mod that has an LED on each line with some switching transistors.  About 1/4 the way down the page here:  http://electro-music.com/forum/topic-11677.html

[egr]

There's a nice circuit out there that someone made for a PSR-6 with the data cut mod that has an LED on each line with some switching transistors.  About 1/4 the way down the page here:  http://electro-music.com/forum/topic-11677.html

That is some really great info!  After a day or two of fiddling with my data-cut PSS170 I came to the conclusion that I really need to re-connect the cuts and put toggles in between.  A patchbay alone is just not user friendly and recovering from crashes is a serious buzz kill.  Not so much success on sounds either. 

I'll be upgrading my board with the toggled bridges as well as adding patch points for the percussion chip (also with toggles).  A lot of work for one toy but I'm determined to get the most fun out of it.

Thanks for pointing me to an excellent reference!!!