RE: (slightly OT:) Parallel port question
Date: 2003-10-10 00:53:28

> -----Original Message-----
> From: ext Spiro Trikaliotis []
> Sent: 09 October, 2003 20:46
> To:
> Subject: Re: (slightly OT:) Parallel port question
> > Well, the solution is simple: drive the port lines with a 
> source that can
> > do three-state.
> > Have it go hihg-impedance while turned on or reset, and let 
> it go out of
> > high-impedance only when the parallel port is working as 
> input. [...]
> This is essentially what I proposed to him. Anyway, he does 
> not like the
> idea to use software to protect the hardware. Think of this: 
> It could be
> that some other program changes the line that is monitored, 
> which would
> result in the erroneous state.
I would be surprised to see the STROBE/ changing state independently of the data lines.
The solution I proposed is as hardware as it ever gets! 
> I remember having seen parallel ports which change their 
> value more than
> once if the BIOS performs the POST.
Frankly, I don't quite understand what you mean, I think I am missunderstanding you. Or maybe I'm understanding what you mean, but I don't see how this would be a problem.> 

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