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Message from discussion External SCSI Plumbing
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Bill Vermillion  
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 More options Feb 24 2001, 7:56 pm
Newsgroups: comp.unix.sco.misc
From: b...@wjv.com (Bill Vermillion)
Date: Sun, 25 Feb 2001 00:07:30 GMT
Local: Sat, Feb 24 2001 7:07 pm
Subject: Re: External SCSI Plumbing
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In article <Pine.GSO.4.31.0102241249400.29802-100000@shell1>,
Lucky Leavell [RIS] <r...@iglou.com> wrote:

>I recently acquired an HP ScanJet IIcx which I have determined
>should work with my UW7 box using an Adaptec 1542B. I know I have
>to remove the terminator on the 1542B for the external cable but
>how are external devices terminated? (I don't have a manual for the
>ScanJet yet or I might already know that one?)
>One final question: There are two SCSI connectors on the back of
>the ScanJet, one looks like the usual 50 pin external connector but
>the other looks like a DB-25 female connector; a DB-25 male plugs
>into it just fine. What sort of SCSI connector is that? SCSI-1?

The 50 pin connector that looks like an overgrown parallel
Centronics connector is a SCSI-I connector.

25 pin SCSI connectors do exist but the violate the SCSI standard
which among other things calls for one ground wire for each signal
wire.

Apple SCSI from the early McIntosh machines used a 25-pin SCSI
cable.  The SCSI connector on the back of the Iomega ZIP drives
is also 25-pin SCSI.

I forget the manufacturer at the moment but in the mid-late 1980s -
this is the early Mac era, there was one other manufacturer who
used the 25 pin cable - and as I recall it was wired differently
so that a power pin was swapped from the 25 pin side to the larger
side and could burn-out/short-out the device or the card.  
You only have to worry about that if you are in the habit of buying
old computer 'stuff' at swap-meets and flea markets.

Bill
--
Bill Vermillion -   bv @ wjv . com


 
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