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From: hyc@math.lsa.umich.edu (Howard Chu)
Newsgroups: comp.periphs.scsi,comp.sys.mac.hardware
Subject: Re: Pinouts for "standard" SCSI <--> Mac SCSI ??
Message-ID: <1990May30.025253.28328@math.lsa.umich.edu>
Date: 30 May 90 02:52:53 GMT
Article-I.D.: math.1990May30.025253.28328
References: <3471@rodan.acs.syr.edu>
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Organization: University of Michigan Math Dept., Ann Arbor
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In article <3471@rodan.acs.syr.edu> jfbruno@rodan.acs.syr.edu (John Bruno) writes:
>I have just purchased a SCSI host adapter for my machine (an Atari 1040ST) and
>the SCSI out on the board has a connector that I assume is a standard SCSI
>connector (if there is such a thing), it looks like this:
>
>  1                                               49
>  . . . . . . . . . . . . . . . . . . . . . . . . .
>  . . . . . . . . . . . . . . . . . . . . . . . . .
>  2                                               50

On a standard 50-pin SCSI cable, just about every other line is just a ground.
On the 25-pin Mac cable, you basically omit the extra ground lines. (And hope
you don't fall prey to too much noise as a result...  }-)

The Supra host adapter for the ST comes with docs including the pinout of the
25-pin cable. I think it's distributable...
--
  -- Howard Chu @ University of Michigan
  ... the glass is always greener on the side ...