I got a problem for sent trigger through parallel port to NeuroScan.

The trigger was to lose a few.I design script :

WritePort &H378, 1 

Sleep (46)

WritePort &H378, 2

Sleep (46)

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Above script has been repeated,so I think that interval time is too close between the two trigger.

but I change the sleep time to 1 second,it still have lost triggers a few.For example,if I sent 100 triggers,

I expect to receive 100 event lable but that just get about 85~90 triggers.Therefore it confused me a lot.

Hope give me a hint

Thanks

Yu-Kai