Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!apple!news
From: bell@apple.com (Mike Bell)
Newsgroups: comp.sys.mac.misc
Subject: Re: Sharing a SCSI HD
Message-ID: <52475@apple.Apple.COM>
Date: 5 May 91 19:41:17 GMT
References: <1991May5.162802.4896@neon.Stanford.EDU>
Sender: nntp@Apple.COM
Reply-To: bell@apple.com (Mike Bell)
Organization: Apple Computer, Inc.
Lines: 50

In article <1991May5.162802.4896@neon.Stanford.EDU>, kaufman@neon.Stanford.EDU 
(Marc T. Kaufman) writes:
> Path: apple!decwrl!stanford.edu!neon.Stanford.EDU!kaufman
> From: kaufman@neon.Stanford.EDU (Marc T. Kaufman)
> Newsgroups: comp.sys.mac.misc
> Subject: Re: Sharing a SCSI HD
> Message-ID: <1991May5.162802.4896@neon.Stanford.EDU>
> Date: 5 May 91 16:28:02 GMT
> References: <0B01FFFB.erxw5i@outpost.UUCP>
> Organization: Computer Science Department, Stanford University, Ca , USA
> Lines: 24
> 
> In article <0B01FFFB.erxw5i@outpost.UUCP> peirce@outpost.UUCP (Michael 
Peirce) writes:
> 
> >In article <1991May5.011353.878@cs.cornell.edu>, swanson@CS.Cornell.EDU 
(Randall A. Swanson) writes:
> 
> -> >> 	Is it possible to share a SCSI Hard drive between a Mac and an Apple
> -> >> IIgs with a SCSI card?
> 
> -> >Nope, it doesn't work.
> 
> -> Actually it works very nicely.  On the Apple II SCSI card you can set the 
ID#
> -> of the CPU.  So all you need to do is set the SCSI ID# on the HD and IIgs
> -> to something different than 7 <that of the Mac> and partition the hard 
drive.
> -> with the first physical partion being a ProDos partion and the other a Mac
> -> partion.
> 
> >Humm, interesting.  Well, it doesn't work with two Macs.  I leapt to
> >the conclusion that the gs did SCSI similar to the way Macs do it.
> 
> The difference is that both Macs want to access the SAME partition, and you
> can't let both control the volume directory at the same time.  In the Mac vs.
> IIgs case, they are working in DIFFERENT partitions, and each can control
> its own directory.
> 
> Marc Kaufman (kaufman@Neon.stanford.edu)



   Actually, the real problem is that the Mac has it's SCSI address fixed at 7. 
So, if you put two Macs on the same SCSI bus, there is an address conflict.....




                    Mike Bell