Date: Mon, 26 May 1997 13:42:12 +0200 From: Stefan Esser <se@FreeBSD.ORG> To: Ollivier Robert <roberto@keltia.freenix.fr> Cc: scsi@FreeBSD.ORG Subject: Re: Oddness with NCR53C810 Message-ID: <19970526134212.20835@x14.mi.uni-koeln.de> In-Reply-To: <19970524124625.07596@keltia.freenix.fr>; from Ollivier Robert on Sat, May 24, 1997 at 12:46:25PM %2B0200 References: <Pine.BSF.3.95.970523204439.567A-100000@why> <19970524102943.GO37893@uriah.heep.sax.de> <19970524124625.07596@keltia.freenix.fr>
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> The NCR810a is an Ultra-capable version of the NCR810 I think. No, sorry, not quite :) The NCR/Symbios SCSI chips are: 810 the original, 8bit, FAST 810a improved version of the 810, more efficent on the PCI bus 815 810 with BIOS support 860 810a with Ultra-SCSI support 820 810 with support for WIDE SCSI 825 improved 820 with BIOS support 825a improved 825 with on-chip 4KB RAM 875 825a with Ultra-SCSI support 876 dual 875 895 875 with Ultra-2 support (40MHz sync. + LVD) There are quite a number of cards with WIDE SCSI chips, but only an 8bit bus (the Symbios Sym8250S or Sym8750S and the Tekram DC-390U, for example). Only very few WIDE NCR cards support differential bus signals (the Sym8250D and Sym8751D do). The Sym53c876 allows to put two Ultra-WIDE SCSI channels on one PCI card, without the need for a PCI to PCI bridge. This is better than an Adaptec 3940 with two SCSI chips behind a PPB, since it is cheaper and avoids the latency and complexity introduced by the PPB ... Regards, STefan
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