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
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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