Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!rex!mgse!fleet!mel
From: mel@fleet.UUCP (mel)
Newsgroups: comp.sys.mac.system
Subject: Re: Preemtive/Cooperative multitasking (Re: All about sys 7.0 <long>)
Message-ID: <12@fleet.UUCP>
Date: 31 Mar 91 22:28:15 GMT
References: <0B010004.4k8s8a@outpost.UUCP> <1991Mar29.020730.15872@cs.uoregon.edu> <10206@hub.ucsb.edu>
Reply-To: mel@fleet.UUCP ()
Organization: Fleet Parts & Equipment
Lines: 18

Bdd
B
>The cure for the problem is DMA, not preemptive multitasking---the i/o
>hardware needs to be able to operate without much cpu intervention.
>
>John E. Doner	doner@henri.ucsb.edu	(805)893-3941
>Dept. Mathematics, UCSB, Santa Barbara, CA 93106

That's a good point.  And why hasn't Apple been able to get DMA working?
The FX supposedly has the capability but no version of the operating
system supports it EXCEPT AUX.  And rumors have it the new '040 CPU's
won't support DMA at all. (Nor does 7.0)

What is going on at Apple in regards to DMA?  Can't someone come forward to
explain why they keep falling down in this one area?

Mel Shear
!rex!fleet!mel