From owner-freebsd-doc@FreeBSD.ORG Tue Oct 28 03:32:19 2003 Return-Path: Delivered-To: freebsd-doc@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4501C16A4CE for ; Tue, 28 Oct 2003 03:32:19 -0800 (PST) Received: from abigail.blackend.org (blackend.org [212.11.35.229]) by mx1.FreeBSD.org (Postfix) with ESMTP id CD70343FF3 for ; Tue, 28 Oct 2003 03:32:16 -0800 (PST) (envelope-from marc@blackend.org) Received: from nosferatu.blackend.org (nosferatu.blackend.org [192.168.10.205]) by abigail.blackend.org (8.12.9/8.12.3) with ESMTP id h9SBWETd006208; Tue, 28 Oct 2003 12:32:15 +0100 (CET) (envelope-from marc@abigail.blackend.org) Received: from nosferatu.blackend.org (localhost [127.0.0.1]) h9SBWEZX034914; Tue, 28 Oct 2003 12:32:14 +0100 (CET) (envelope-from marc@nosferatu.blackend.org) Received: (from marc@localhost) by nosferatu.blackend.org (8.12.9/8.12.9/Submit) id h9SBWDmY034913; Tue, 28 Oct 2003 12:32:13 +0100 (CET) (envelope-from marc) Date: Tue, 28 Oct 2003 12:32:12 +0100 From: Marc Fonvieille To: Peter Pentchev Message-ID: <20031028113212.GB583@nosferatu.blackend.org> References: <3F9DF133.3000104@sitetronics.com> <20031028082305.GA583@nosferatu.blackend.org> <20031028103425.GV430@straylight.oblivion.bg> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="tThc/1wpZn/ma/RB" Content-Disposition: inline In-Reply-To: <20031028103425.GV430@straylight.oblivion.bg> User-Agent: Mutt/1.4.1i X-Useless-Header: blackend.org X-Operating-System: FreeBSD 5.1-CURRENT cc: freebsd-doc@freebsd.org Subject: Re: Printer Setup (11.3.1.1.1) X-BeenThere: freebsd-doc@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Documentation project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Oct 2003 11:32:19 -0000 --tThc/1wpZn/ma/RB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Oct 28, 2003 at 12:34:25PM +0200, Peter Pentchev wrote: >=20 > Errrr... I'm not sure it needed fixing :) Rather, IMHO rev. 1.79 might > need to be reverted. >=20 > Historically, parallel ports did indeed offer only one-way > communication: the computer sent data to the printer, and that was it. > Then things like EPP (the extended printer port) interface and friends > were developed, and the parallel port grew two-way communication, too - > this is exactly what the *last* sentence is talking about (EPP and ECP > were standardized in IEEE 1284, http://www.fapo.com/ieee1284.htm for > more info). >=20 > Serial port communications have always been two-way, AFAIK, albeit some > of them were just half-duplex, so only one side could talk at a time. > Oh you're right, I just had that half-duplex in mind. I always thought serial printers used half-duplex. > Thus, I think the text was correct as it was, before rev. 1.79 - > parallel ports were once only capable of one-way communication, but with > IEEE 1284 (EPP, ECP) they can do two-way now, while serial ports have > always been capable of two-way communication. >=20 I reverted the commit and added EPP, ECP in the last sentence, it will be less confusing. Marc --tThc/1wpZn/ma/RB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (FreeBSD) iD8DBQE/nlO781T1MWxkgcoRAltOAJ99MMxYRc16KVreoCM33Cceu/LbKQCgjBR/ FfaykXFA4xXM+hiCVq3ZniI= =pKrn -----END PGP SIGNATURE----- --tThc/1wpZn/ma/RB--