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Cheers Ian,

I'm not sure if you were telling me to make sure it was ECP or it wasn't - however, I checked and it was ECP - so I figured that might be too clever for the board, changed it to...

Thanks for all the help - looks like I'll run up to Maplins and get a logic probe.

I get the impression that no-one else has had this issue when they put in the 100pf caps then. My problem is...

In my experience, although you can't see individual pulses, an LED across a parallel port will glow if the pin is active - I'm not sure whether it will work with the tb6560 board attached though. In...

Unfortunately no, I don't have an oscilloscope. Open to suggestions on other ways to detect this - obviously just sound doesn't work as the motors are spinning when this is happening. I might be able...

Yes, it is independent of speed.

I have a 3-axis version of this board and have noticed that it occasionally missed a few steps. I have read this thread start to finish and decided that the most likely changes to fix this would be...