From owner-freebsd-current Sat Jan 22 2:57:48 2000 Delivered-To: freebsd-current@freebsd.org Received: from postfix2.free.fr (postfix2.free.fr [212.27.32.74]) by hub.freebsd.org (Postfix) with ESMTP id 2DE5015554 for ; Sat, 22 Jan 2000 02:57:45 -0800 (PST) (envelope-from nsouch@free.fr) Received: from free.fr (paris11-nas5-23-235.dial.proxad.net [213.228.23.235]) by postfix2.free.fr (Postfix) with ESMTP id 01FBC7403E; Sat, 22 Jan 2000 11:57:42 +0100 (MET) Received: (from nsouch@localhost) by free.fr (8.9.3/8.9.3) id NAA06525; Sat, 22 Jan 2000 13:05:53 +0100 (CET) (envelope-from nsouch) Message-ID: <20000122130552.35038@breizh.free.fr> Date: Sat, 22 Jan 2000 13:05:52 +0100 From: Nicolas Souchu To: Doug Rabson Cc: "F. Heinrichmeyer" , "freebsd-current@FreeBSD.ORG" Subject: Re: Parallel Port Zip Drive works when EPP-Mode is choosen in Bios References: <20000122090548.17844@armor.free.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.81e In-Reply-To: ; from Doug Rabson on Sat, Jan 22, 2000 at 10:03:25AM +0000 X-Operating-System: FreeBSD breizh 4.0-CURRENT FreeBSD 4.0-CURRENT Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sat, Jan 22, 2000 at 10:03:25AM +0000, Doug Rabson wrote: >> >> Nice. The newbus architecture introduces overhead in I/O and old chipsets >> (or old compatible modes) do not always support it. >> >> Your drive runs really faster too, doesn't it? > >Have you measured the overhead? I think it should be trivial compared to >the effort of using inb/outb to poll a port. No, but each time function calls are introduced in the ppbus framework (initially to isolate ppbus layers and now with newbus) some parallel port stop working. Certainly more a timing issue than a performance issue I think. But some good hardware never failed, some bad hardware fails with either slow (486) or fast processors. > >-- >Doug Rabson Mail: dfr@nlsystems.com >Nonlinear Systems Ltd. Phone: +44 181 442 9037 > > > -- nsouch@free.fr / nsouch@freebsd.org FreeBSD - Turning PCs into workstations - http://www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message