Date: Thu, 27 Aug 1998 17:14:48 +0200 (CEST) From: Wilko Bulte <wilko@yedi.iaf.nl> To: tlambert@primenet.com (Terry Lambert) 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: <199808271514.RAA17496@yedi.iaf.nl> In-Reply-To: <199808262030.NAA20478@usr02.primenet.com> from Terry Lambert at "Aug 26, 98 08:30:24 pm"
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As Terry Lambert wrote... > > > 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. Hm. You might have a one-off prototype or whatever. > 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. You could check the EISA config string, a 1740 is an ADP0000 and a 1740A is a ADP0001 if I remember well. For the 1740 there are multiple sets of firmware/BIOS around, the newer ones have different translations so you can acommodate a big drive. Wilko _ ______________________________________________________________________ | / o / / _ Bulte email: wilko@yedi.iaf.nl |/|/ / / /( (_) Arnhem, The Netherlands WWW : http://www.tcja.nl ______________________________________________ Powered by FreeBSD __________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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