parallel port communication: event markers

[David McFarlane]

>Of course, you could also just use the one slide you currently have 
>and add a little inline after that:
>WritePort &H378, Asc(Proposal1.RESP)

If you go this route (which is probably how I would do it), depending 
on how the PsychLab equipment works you might also need to send a 
full "pulse" and reset the output before continuing, something like

WritePort &H378, Asc(Proposal1.RESP)
Sleep 20
WritePort &H378, 0


Oh, following my fussy habits I would also replace the "magic number" 
&H378 with a proper constant, e.g.,

Const LptDataPort as Integer = &H378
WritePort LptDataPort, Asc(Proposal1.RESP)
Sleep 20
WritePort LptDataPort, 0

-- David McFarlane, Professional Faultfinder


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