Date: Wed, 26 Aug 1998 20:30:24 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: wilko@yedi.iaf.nl (Wilko Bulte) Cc: tlambert@primenet.com, joelh@gnu.org, dakott@alpha.delta.edu, hackers@FreeBSD.ORG Subject: Re: Adaptec 1542i Performance on -stable [was Re: SCSI Controller] Message-ID: <199808262030.NAA20478@usr02.primenet.com> In-Reply-To: <199808260918.LAA07176@yedi.iaf.nl> from "Wilko Bulte" at Aug 26, 98 11:18:19 am
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> > This goes for the 1742B, as well. > > There is no 1742B. Only a 174x and 174xA (x =[02] for (no)floppy interface). > > The 174x are all sensitive to using both internal and external cabling > at the same time. For our Alphaservers we simply made that an unsupported > config. In addition 174x are sensitive to which disks you use, some > simply don't work, primarily the newer/faster ones. I'm pretty sure that the 1742 controller in my machine with the 50MHz 486DX (*NOT* DX2), and on which I clock my EISA bus at 50MHz because the 1742B could handle it, where the 1742A could not, is a 1742B. I remember getting it at the time becayse it out performed a Pentium 66 clock doubled from 33 MHz because of the aditional 17MHz of memory and I/O bus speed; that, and Intel and AMD had both promised clock doubled DX2/100 *NOT* DX4/100) chips that would use the 50MHz bus in this ASUS motherboard. I'm also pretty sure the "B" comes from the EISA configuration capability that I had to read the serial number to the Adaptec people so they could tell me if the card supported it, whereby I was able to configure a non-standard translation mode to support larger drives than would otherwise be possible on a 1742/1742A. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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