Hi As posted before you can generate an interrupt on the parallel port. We do this in an aplication not running under linux [:-(], but i'm working on a free avariable port. This project has just started and will take a while, because I'm new to RTL, Comedi and all that stuff. Btw: hello to all on this list. So much on that. If you want to parallel port your problem is the speed. We work around this problem by putting a PPS-Pulsformer (to stretch the PPS) and a Flip-Flop in a adaptor on the par-port. The FlipFlop is powered by pin 14,16,17 (/init, /autofeed, select in) and generates a interrupt on pin 10 (acknlg). Then the FlipFlop is reseted by the isr by setting pin 1 (strobe) high. The hole thing fits into a standart parport adaptor. And works fine for us for several years. We use the pps to sync our system to gps and to compensate the drift of the PC-Quarz (caused by temperature and normal drift). Hope this is useful to you
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