Date: Fri, 9 Jun 1995 01:18:45 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: kuku@gilberto.physik.rwth-aachen.de (Christoph P. Kukulies) Cc: freebsd-hackers@freefall.cdrom.com Subject: Re: aha1542 bus speeds Message-ID: <199506090818.BAA05571@gndrsh.aac.dev.com> In-Reply-To: <199506081858.UAA06489@gilberto.physik.rwth-aachen.de> from "Christoph P. Kukulies" at Jun 8, 95 08:58:37 pm
next in thread | previous in thread | raw e-mail | index | archive | help
>
> The AH1542CF allows a couple of bus speeds in the BIOS setup (^A) amongst
> others there are 10MB/s, 8MB/s. When looking at /sys/i386/isa/ah1542.c
> there is the array aha_bus_speeds[]= {0x88,100},{0x99,150} and so on.
> Why are these ns figures not reflect the actual (possible) MB/s values?
They do if you look at a 1542B. These numbers come right out of the
1542B programmers manual, and a 1542B has a jumper that allows the
settings 5.0, 5.7, 6.7, 8.0 and 10.0MB/sec. This values correspond
to 200.0, 175, 150, 125, and 100ns.
--
Rod Grimes rgrimes@gndrsh.aac.dev.com
Accurate Automation Company Custom computers for FreeBSD
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199506090818.BAA05571>