From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261595AbTDOOek (for ); Tue, 15 Apr 2003 10:34:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261598AbTDOOek (for ); Tue, 15 Apr 2003 10:34:40 -0400 Received: from [62.231.65.103] ([62.231.65.103]:6149 "HELO ultrapopular.com") by vger.kernel.org with SMTP id S261595AbTDOOei (for ); Tue, 15 Apr 2003 10:34:38 -0400 Message-ID: <3E9C1B7C.2010807@easynet.ro> Date: Tue, 15 Apr 2003 17:47:24 +0300 From: Alexandru Damian User-Agent: Mozilla/5.0 (X11; U; Linux i686; ro-RO; rv:1.2.1) Gecko/20030225 X-Accept-Language: ro, en, en-us MIME-Version: 1.0 To: filip CC: linux-kernel@vger.kernel.org Subject: Re: paralel port - doesn't keep pins states References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 >- >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ > > > >