Path: utzoo!attcan!utgpu!watmath!watdragon!rose!ccplumb From: ccplumb@rose.waterloo.edu (Colin Plumb) Newsgroups: comp.arch Subject: Re: *big iron* Message-ID: <16661@watdragon.waterloo.edu> Date: 25 Sep 89 16:46:17 GMT References: <21962@cup.portal.com> <1989Sep12.031453.22947@wolves.uucp> <22130@cup.portal.com> <1989Sep16.044013.429@wolves.uucp> <259@ssp1.idca.tds.philips.nl> <22308@cup.portal.com> <7981@cbmvax.UUCP> <11538@burdvax.PRC.Unisys.COM> <22488@cup.portal.com> Sender: daemon@watdragon.waterloo.edu Reply-To: ccplumb@rose.waterloo.edu (Colin Plumb) Organization: U. of Waterloo, Ontario Lines: 13 In article <22488@cup.portal.com> cliffhanger@cup.portal.com (Cliff C Heyer) writes: > I'm hoping some engineers might speak up who have actually designed PC disk > I/O subsystems and could tell us why they didn't try for 900KB/sec like on > the Amiga. In their defense, they're handicapped by the MS-DOS file system, which is pretty piss-poor. Randell's figures are using the rewritten file system; replacing MS-DOS's is trickier. A 2090A SCSI controller with a CDC Wren III can do 1.2MB/sec through the device driver and the 2091 is probably faster, so it's possible I will be able to get 1MB/sec I/O out of my 7.14MHz 68000 one day. -- -Colin