Date: Sat, 22 Jan 2000 13:05:52 +0100 From: Nicolas Souchu <nsouch@free.fr> To: Doug Rabson <dfr@nlsystems.com> Cc: "F. Heinrichmeyer" <fritz.heinrichmeyer@fernuni-hagen.de>, "freebsd-current@FreeBSD.ORG" <freebsd-current@freebsd.org> Subject: Re: Parallel Port Zip Drive works when EPP-Mode is choosen in Bios Message-ID: <20000122130552.35038@breizh.free.fr> In-Reply-To: <Pine.BSF.4.10.10001221002240.25770-100000@salmon.nlsystems.com>; from Doug Rabson on Sat, Jan 22, 2000 at 10:03:25AM %2B0000 References: <20000122090548.17844@armor.free.fr> <Pine.BSF.4.10.10001221002240.25770-100000@salmon.nlsystems.com>
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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
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