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Path: utzoo!linus!decvax!tektronix!ucbcad!ucbvax!fair
From: fair@ucbvax.UUCP
Newsgroups: net.micro,net.works
Subject: Re: faster disk, UNIX(tm), for Lisa
Message-ID: <256@ucbvax.UUCP>
Date: Fri, 29-Jul-83 02:43:30 EDT
Article-I.D.: ucbvax.256
Posted: Fri Jul 29 02:43:30 1983
Date-Received: Sat, 23-Jul-83 22:12:48 EDT
References: <1798@utcsrgv.UUCP>
Organization: U. C. Berkeley Computer Science
Lines: 11

Part of the problem with the Lisa's "profile" disk sub-system is that
it doesn't do DMA, in spite of the existence of interfaces for that
somewhere in the back of the thing. I remember this from a talk that
Scott Bryan of UniSoft gave at Uni-Ops in January (February?) in Palo
Alto, CA. Scott did UniSoft's port of UNIX to the Lisa. As for a faster
UNIX, part of the problem there is the fancy graphics screen it uses.
The 68000 loses cycles scrolling it. That's why it's only 5 MHZ.

	Erik E. Fair	ucbvax!fair	fair@ucb-arpa
			{ucbvax,amd70,zehntel}!dual!fair
			Dual Systems Corporation