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From: ridder@elvira.enet.dec.com (Hans Ridder)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Apple SCSI not compatible with standard SCSI?
Message-ID: <502@shodha.dec.com>
Date: 30 Nov 89 17:29:03 GMT
References: <ANDREWT.89Nov13165620@watsnew.waterloo.edu> <1410036@hpcvca.CV.HP.COM>
Sender: news@shodha.dec.com
Organization: Digital Equipment Corporation, Customer Support Center
Lines: 27

In article <1410036@hpcvca.CV.HP.COM> charles@hpcvca.CV.HP.COM (Charles Brown) writes:
>>      Hummm.  I am in the process of hacking together a 50pin-to-25pin
>> connector for a StarDrive I recently got.  The target drive (my
>> roomate's) is a miniscribe 8425S.  Is this drive differential?
>
>No.  SCSI is not differential.  It merely (most of the time)
>interdigitates signals and grounds in the 50 wire ribbon cable.
>Sort of a poor man's differential drive.

No, SCSI *can be* differential.  The SCSI specification clearly
defines two electrical interfaces.  One is differential, the other
"single-ended".  The single-ended version is probably more popular
because is it cheaper to implement.  Please know what you're talking
about before posting assertions like this.

>>                Dave Williams
>>                  dawill@hubcap.clemson.edu
>--
>	Charles Brown	charles@cv.hp.com or charles%hpcvca@hplabs.hp.com
>			or hplabs!hpcvca!charles or "Hey you!"
>	Not representing my employer.

-hans
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  Hans-Gabriel Ridder			Digital Equipment Corporation
  ridder@elvira.enet.dec.com		Customer Support Center
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