From: Alexandru Damian <ddalex_krn@easynet.ro>
To: filip <filip_@op.pl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: paralel port - doesn't keep pins states
Date: Tue, 15 Apr 2003 17:47:24 +0300 [thread overview]
Message-ID: <3E9C1B7C.2010807@easynet.ro> (raw)
In-Reply-To: <E192JNC-0004Dy-00@f28.test.onet.pl>
filip wrote:
>Hello,
>
>I hope it is the right place to ask about my problem...
>
>I want to use /dev/lp0 (lp module) on my PC for controlling
>external devices.
>The problem is when I wtire 1 byte to /dev/lp0, paralel port
>keeps this state just for few ms...
>(I made special plug - so the is no problem with handshake - details on:
>http://www.hut.fi/Misc/Electronics/circuits/nullprint.html)
>
>
It's normal, since the parallel -port specification clearly states that
the port doesn't maintain
the pins voltage more than a minimum mandatory delay, and while setting,
the
state is undefined.
>It is strange because everything works corect on my old PC (Pentium160).
>
That was broken hardware, it didn't meet the specifications :))
>
>Regards,
>Filip
>-
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>
>
prev parent reply other threads:[~2003-04-15 14:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-06 23:16 paralel port - doesn't keep pins states filip
2003-04-15 14:47 ` Alexandru Damian [this message]
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