Date: Wed, 17 Dec 1997 05:34:09 GMT From: jak@cetlink.net (John Kelly) To: Mike Smith <mike@smith.net.au> Cc: Mike Smith <mike@smith.net.au>, FreeBSD Hackers <hackers@FreeBSD.ORG> Subject: Re: 3com 3c509 card Message-ID: <349c63b3.102223169@mail.cetlink.net> In-Reply-To: <199712170416.OAA01477@word.smith.net.au> References: <199712170416.OAA01477@word.smith.net.au>
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On Wed, 17 Dec 1997 14:46:08 +1030, Mike Smith <mike@smith.net.au> wrote: >> I seem to have one 486 board running at 12 MHz ISA and clock doubled >> 50/100MHz DX4-100 CPU will no apparent problems. This has reduced my >> (measured) 8 bit I/O cycle time to 0.65 usec. I don't have a suitable >> method for measuring the 16-bit cycle time, but I'm hoping for nearly >> 4MB through this supercharged bus in 16-bit mode. > >You can expect that it will be half, based on the 6 clock/3 clock >ratio, so about 325ns. That would be an upper limit of 6MB, so with overhead maybe 4MB is attainable. I'll learn more when I get around to setting up the router and testing it. John
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