Date: Thu, 9 Oct 1997 16:57:20 -0700 (PDT) From: mdean <mdean@best.com> To: freebsd-hackers@freebsd.org Subject: Reliable probing techiniques for isa bus? Message-ID: <Pine.SGI.3.95.971009165204.26271A-100000@shellx.best.com>
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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?
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