Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!brl-adm!seismo!mcvax!ukc!reading!onion!minster!martin
From: martin@minster.UUCP
Newsgroups: comp.periphs,comp.sys.mac
Subject: Re: Making a Mac talk SCSI to a Sun
Message-ID: <540211194.20192@minster.UUCP>
Date: Fri, 13-Feb-87 05:39:55 EST
Article-I.D.: minster.540211194.20192
Posted: Fri Feb 13 05:39:55 1987
Date-Received: Sun, 15-Feb-87 09:22:40 EST
References: <2594@phri.UUCP> <1784@hoptoad.uucp>
Reply-To: martin@minster.UUCP (martin)
Distribution: world
Organization: Department of Computer Science, University of York, England
Lines: 20
Xref: utgpu comp.periphs:209 comp.sys.mac:1335

In article <1784@hoptoad.uucp> tim@hoptoad.UUCP (Tim Maroney) writes:
>I believe there would be problems with having two SCSI masters.  A better

No, SCSI (as opposed to SASI) was explicitly designed to allow any, or
all, of the devices to be masters. If having two masters dosn't work, then
one of the machines dosn't implement SCSI correctly (or completely!).

I don't know about the implementations on the Sun, or the Mac, but all
high performance (which I assume the Sun interface, at least is) interfaces
should implement disconnect-reconnect to allow overlapped seeks, and
this automatically gives one the multi-master capability (again so long
as the software is not broken :-).

	Martin

PS
	The review of the Mac+ in November '86 Byte states that the
throughput of the SCSI interface is 320K bytes per second; does anyone
know if it is really this slow? SCSI is rated at 10M Bits (= 1.25 M Bytes)
per second, where is the factor of (almost) four going?