Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!yale!spock!odicon!jlg From: jlg@odicon.UUCP (John L. Grzesiak) Newsgroups: comp.unix.i386 Subject: Re: SCSI and 386/ix Summary: Nope .... Keywords: scsi 9380s under 386/ix Message-ID: <290@odicon.UUCP> Date: 4 Feb 90 07:25:53 GMT References: <25c1fdd8:490comp.unix.i386@nstar.UUCP> Organization: Omega Dynamics ,Wallingford Ct . ODICON Lines: 20 In article <25c77e8b:490.5comp.unix.i386;1@nstar.UUCP>, larry@nstar.UUCP (Larry Snyder) writes: > >The real win is with *two* SCSI drives; while an RLL controller > >usually is WD1003 compatible, and thus cannot possibly support > >overlapped seeks or transfers, the ACB 1542 will support these, > > How about getting 2 2372B RLL controllers each controlling 1 drive? > Wouldn't this have the same effect as two SCSI drives on the 1542? In a word : no... While it would seem that this would allow a greater bandwidth thru the AT bus , they 1542A as a bus master is actually faster than two good ESDI controllers (Never mind RLL-st506). We won't go into how DMA controllers work , since there are several good books on the subject available. *-----------------------------------------------------------------* * John Grzesiak @ Omega Dynamics : Specializing in UNIX/XENIX * * Meriden Ct USA : Consulting . . . * * jlg@odicon or spock!odicon!jlg : gaboon!odicon!jlg * *-----------------------------------------------------------------*