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Many Thanks for the advice Coen. Have been looking at this further and seems like the problem is with Presentation setting all the pins high on the USB6501 port we are using with Presentation. We can fix it by manually setting them low in the NI software but is reset when ever Presentation is restar...

Hi Coen, We have just started using the National Instruments digital IO card (USB6501) to send trigger codes to Biosemi using Presentation. Have been through the faq section of this website and think our cabling and pin outs are good as well as the NI card configuration but are having problems with ...

Just a followup - i notice on the Biosemi site (Presentation faq) that Biosemi is planing to release one of these usb devices later in the year so maybe contact them as well.

Yes the days of the parallel ports are surely nearing the end! There are a number of usb devices that you can now use to generate ttl signals to trigger or record event codes with biosemi. There is one on Cortech's website which have one listed somewhere but also check with your local Biosemi sales ...