Re: (slightly OT:) Parallel port question

From: Spiro Trikaliotis (trik-news_at_gmx.de)
Date: 2003-10-09 19:46:28

Hello,

thank you Marko, Groepaz, Lee Davison and Gianmario for your suggestions. I
forwarded them to him, let's see if it helps him in any way.

On Thu, Oct 09, 2003 at 05:47:59AM +0300, Gianmario.Scotti@nokia.com wrote:

> 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 remember having seen parallel ports which change their value more than
once if the BIOS performs the POST.

Spiro.

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