From owner-freebsd-hackers Thu Oct 9 16:58:19 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id QAA08876 for hackers-outgoing; Thu, 9 Oct 1997 16:58:19 -0700 (PDT) (envelope-from owner-freebsd-hackers) Received: from proxy4.ba.best.com (root@proxy4.ba.best.com [206.184.139.15]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id QAA08867 for ; Thu, 9 Oct 1997 16:58:14 -0700 (PDT) (envelope-from mdean@shellx.best.com) Received: from shellx.best.com (shellx.best.com [206.86.0.11]) by proxy4.ba.best.com (8.8.7/8.8.BEST) with ESMTP id QAA26337 for ; Thu, 9 Oct 1997 16:57:21 -0700 (PDT) Received: from localhost (mdean@localhost) by shellx.best.com (8.8.6/8.8.3) with SMTP id QAA00896 for ; Thu, 9 Oct 1997 16:57:20 -0700 (PDT) Date: Thu, 9 Oct 1997 16:57:20 -0700 (PDT) From: mdean To: freebsd-hackers@freebsd.org Subject: Reliable probing techiniques for isa bus? Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk If I have an isa card which occupies 16 ports but only uses 9 of them, I've put in some debugging code to see what can be read from the card at boot time. The read/write ports are random depending on what the card in connected to, the control ports are write only, and so I am only left with the other 5 ports on the card that aren't used and the pattern they are in. Is it expected that you will always read 0xff from an unused port, because that is what I am getting?