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Old 07-10-2001, 08:01 AM   #1
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Join Date: May 2001
Location: Australia
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Exclamation Parallel port chip & interrupts
I'm using the parallel port on a touch-screen PC to control part of my Hi-Fi system. But I need to be able to generate an interrupt from the ACK signal on either negative OR positive edges (the PC default is negative-only; but if it can be changed, I can change the polarity on each interrupt, to wait for the next pulse-edge [I want to measure pulse-widths]).
Can anyone tell me the port's chip type number? It will probably vary from manufacturer to manufacturer, and maybe over time too (progress!), but is probably still register-compatible with some "industry-standard" chip. If I know the chip type I can look up its data sheet to see how to program the interrupt edge polarity.
Many thanks,
Daniel
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