Date: Tue, 28 Oct 2003 12:34:25 +0200 From: Peter Pentchev <roam@ringlet.net> To: Marc Fonvieille <blackend@freebsd.org> Cc: freebsd-doc@freebsd.org Subject: Re: Printer Setup (11.3.1.1.1) Message-ID: <20031028103425.GV430@straylight.oblivion.bg> In-Reply-To: <20031028082305.GA583@nosferatu.blackend.org> References: <3F9DF133.3000104@sitetronics.com> <20031028082305.GA583@nosferatu.blackend.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--FwyhczKCDPOVeYh6 Content-Type: text/plain; charset=windows-1251 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Oct 28, 2003 at 09:23:05AM +0100, Marc Fonvieille wrote: > On Tue, Oct 28, 2003 at 05:31:47AM +0100, Devon H. O'Dell wrote: > > In this section there's the text: > > In general, serial interfaces are slower than parallel interfaces.=20 > > Parallel interfaces usually offer just one-way communication (computer= =20 > > to printer) while serial gives you two-way. Many newer parallel ports= =20 > > and printers can communicate in both directions under FreeBSD when a=20 > > IEEE1284 compliant cable is used. > >=20 > > Shouldn't the second sentence s/serial/parallel/ s/Parallel/serial/ ? > > >=20 > Ok, I fixed it in revision 1.79 of the chapter, Thanks! Errrr... I'm not sure it needed fixing :) Rather, IMHO rev. 1.79 might need to be reverted. 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). 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. 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. G'luck, Peter --=20 Peter Pentchev roam@ringlet.net roam@sbnd.net roam@FreeBSD.org PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint FDBA FD79 C26F 3C51 C95E DF9E ED18 B68D 1619 4553 "yields falsehood, when appended to its quotation." yields falsehood, when = appended to its quotation. --FwyhczKCDPOVeYh6 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQE/nkYx7Ri2jRYZRVMRAtClAJ90m01XT8l20CULxIASXny32/YTUACfRI2q gmLdEs9+ALXnJ7l0hsgkIRM= =QbVY -----END PGP SIGNATURE----- --FwyhczKCDPOVeYh6--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20031028103425.GV430>