From owner-freebsd-hackers Thu Sep 18 00:20:45 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id AAA14495 for hackers-outgoing; Thu, 18 Sep 1997 00:20:45 -0700 (PDT) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id AAA14486 for ; Thu, 18 Sep 1997 00:20:40 -0700 (PDT) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id JAA05181 for hackers@FreeBSD.ORG; Thu, 18 Sep 1997 09:20:39 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.8.7/8.8.5) id JAA06245; Thu, 18 Sep 1997 09:13:06 +0200 (MET DST) Message-ID: <19970918091306.RY00955@uriah.heep.sax.de> Date: Thu, 18 Sep 1997 09:13:06 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: hackers@FreeBSD.ORG Subject: Re: INB question References: <199709180041.RAA21191@usr04.primenet.com> X-Mailer: Mutt 0.60_p2-3,5,8-9 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199709180041.RAA21191@usr04.primenet.com>; from Terry Lambert on Sep 18, 1997 00:41:48 +0000 Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk As Terry Lambert wrote: > If a device doesn't exist, what does inb return? 0xff, right? Often. More exactly, it returns a random value with a tendency to 0xff. > Specifically, how do I know if something lives at a given port? Use a real bus where access to a non-existing address causes a bus error. Forget about ISA. :-/ -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)