Date: Sun, 28 Sep 1997 18:50:03 +0930 From: Mike Smith <mike@smith.net.au> To: Tony Overfield <tony@dell.com> Cc: Mike Smith <mike@smith.net.au>, hackers@FreeBSD.ORG Subject: Re: INB question Message-ID: <199709280920.SAA05505@word.smith.net.au> In-Reply-To: Your message of "Sun, 28 Sep 1997 02:00:01 EST." <3.0.2.32.19970928020001.006ce080@bugs.us.dell.com>
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> >Read it again. 1.3MegaWords. Specifically, implying that it's making > >1.3 million 16-bit I/O transactions per second, or 2.6MB/sec. > > > >Yes, this is substantially faster than I was expecting. 8) > > 16-bit ISA I/O cycles are not only wider but also faster than 8-bit ISA > I/O cycles. Back when IDE drives were still attached to the ISA bus, a > fast drive could transfer about 3.5MB/sec, but 2.5MB/sec or 2MB/sec was > more typical. The speed depends on the chipset and the way that the > BIOS programs the ISA timing options. Gotcha. Hmm, does this mean that you can read an 8-bit peripheral faster by using 16-bit cycles, or will the sizing signals trip you up? mike
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