Hi Lee,

Thanks for that. When I said could not get motion, that was only last night when I plugged it into the additional PCI parallel port as a trial. When it is plugged into the main parallel port all steppers move fine, except for the glitching which I think is leading to lost steps.

The glitching has been there from day one (about 1.5 years ago) long before I added the second PCI port card, so I think this is OK, but will remove anyway as part of the trial.

There must be something upsetting the pulse output from the PC. I've got some ideas but as this is a hobby it will have to wait for the next window.

Suggestions welcome !

Thanks
Barry