Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!rutgers!texbell!merch!cpe!adaptex!neese
From: neese@adaptex.UUCP
Newsgroups: comp.unix.xenix
Subject: Re: Disk IO under SCO
Message-ID: <7100018@adaptex>
Date: 6 Sep 89 23:11:00 GMT
References: <1049@lakesys.UUCP>
Lines: 11
Nf-ID: #R:lakesys.UUCP:1049:adaptex:7100018:000:374
Nf-From: adaptex.UUCP!neese    Sep  6 18:11:00 1989


Most disk controllers for the AT bus do not have provisions for DMA
usage.  That is they don't even have the REQ/ACK or channel support
for the AT DMA.  Even if the controller would support it, the AT DMA
is awfully slow when compared to PIO.


			Roy Neese
			Adaptec Central Field Applications Engineer
			UUCP @ {texbell,killer}!cpe!adaptex!neese
				merch!adaptex!neese