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From: unknown@ucscb.UCSC.EDU (The Unknown User)
Newsgroups: comp.sys.apple2
Subject: Re: Hard Drives
Message-ID: <15136@darkstar.ucsc.edu>
Date: 29 Apr 91 00:15:05 GMT
References: <15111@darkstar.ucsc.edu> <6169@vela.acs.oakland.edu> <48066@ut-emx.uucp>
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In article <48066@ut-emx.uucp> daveh@ccwf.cc.utexas.edu (Dave Huang) writes:
>I believe the drives themselves are the same (since I've seen Seagate
>SCSI drives advertized in both IBM and Mac mags). However, the Mac's
>SCSI port is slightly nonstandard. It doesn't support bus arbitration
>correctly or something, so you can't hook two Macs to one HD. The
>Apple II SCSI cards don't have this problem though.

	Another difference is that 25 of the 50 pins are ground on 
"standard" SCSI connectors, yet Apple uses a 25 pin connector, so most of the
grounds are gone.

	If someone, in e-mail if they wish, would like to explain to me why
multiple grounds are useful/wanted, I'd greatly appreciate it. (Also, why 
car manuals say to connect the negative jumper cable to the body of the
car and not the negative battery terminal when they are CONNECTED already)

	I was told by a former Apple employee that arbitration is possible
on the Mac and Apple //.. That is, you could connect a drive to both at the
same time.  There's some more work involved and I don't know the 
details, but it's apparently POSSIBLE while maybe a pain to do...

>Yup, prices are getting pretty good these days! Check out the Mac
>magazines for HD prices. I've seen external Quantum 105 drives for
>around $399 with a 2 year warranty.

	Yeah, Syquest drives are plummeting in price too.. Like $500 is
a price you can easily get. GREAT! (I already have a hard drive now but
might get a Syquest for a 2nd drive and backup mechanism).
-- 
/unknown@ucscb.ucsc.edu Apple IIGS Forever! WANT ULTIMA VI //e or GS?-mail me.\
\CHEAP CDs info-mail me. McIntosh Junior:  The Power to Crush the Other Kids. /