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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.bhp.com.au!mel.dit.csiro.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.uoknor.edu!news.nodak.edu!netnews1.nwnet.net!news.u.washington.edu!uw-beaver!uhog.mit.edu!news.kei.com!nntp.coast.net!news2.acs.oakland.edu!news1.cris.com!news From: dantso@cris.com (Daniel Ts'o) Newsgroups: comp.periphs.scsi,comp.unix.bsd.freebsd.misc Subject: AHA1505,10,20 vs. ATAPI IDE CDROM, and EISA Date: Sat, 10 Feb 96 19:27:11 GMT Organization: Baylor College of Medicine Lines: 19 Message-ID: <4firfg$7j4@spectator.cris.com> NNTP-Posting-Host: crc13-fddi.cris.com X-Newsreader: News Xpress Version 1.0 Beta #4 Xref: euryale.cc.adfa.oz.au comp.periphs.scsi:46390 comp.unix.bsd.freebsd.misc:13556 We have a SB16 SCSI which has the AHA 1510 on board, intended for a CDROM. Given that the 1510 is not a bus mastering SCSI controller, why and under what circumstances would the performance and CPU load be better using a SCSI CDROM drive with the SB16 over a (cheaper) IDE CDROM. Is using the AHA1510 still better if it can do DMA ? I saw it mentioned somewhere that in an EISA PC the 1510 can do DMA. Is this true and would thus be better than an IDE CDROM ? Please email. Thanks. Cheers, Dan Ts'o Division of Neuroscience Baylor College of Medicine 1 Baylor Plaza S603 Houston, TX 77030 dantso@cris.com 713-798-3331 713-798-3897 FAX