Date: Sun, 28 Sep 1997 18:48:57 +0930 From: Mike Smith <mike@smith.net.au> To: Tony Overfield <tony@dell.com> Cc: Terry Lambert <tlambert@primenet.com>, hackers@freebsd.org Subject: Re: INB question Message-ID: <199709280919.SAA05487@word.smith.net.au> In-Reply-To: Your message of "Sat, 27 Sep 1997 05:55:43 EST." <3.0.2.32.19970927055543.006bd29c@bugs.us.dell.com>
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> At 02:44 PM 9/19/97 +0000, Terry Lambert wrote: > >> > Yeah; that's why I picked the extended MCA DMA ports for the detect; > >> > that, and I can do the probe non-destructively, with the expectation of > >> > a 0 bit in my data and no hardware configuratio changes resulting. > >> > >> Where is the port exactly? ie. is it likely to be sat on or masked > >> over by an ISA device? > > > >Port 0x18 is the control, and port 0x1A is the data. > > Port 0x18, on many systems, is an alias of port 0x08, which is > the read-only DMA status register and the write-only DMA command > register. Likewise, port 0x1A is often an alias of the write-only > port 0x0A DMA mask register. Eep. That's not so good then. Now you're back; do *you* know how to identify an MCA machine uniquely? mike
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