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From: john@ncrgb.london.ncr.uk (john)
Newsgroups: comp.sys.dec,comp.os.vms,comp.sys.ncr
Subject: Re: Need help interfacing NCR SCSI device to Vax
Message-ID: <162@ncrgb.london.ncr.uk>
Date: 12 Jun 91 08:27:12 GMT
References: <1991Jun6.135312.513@dragon.com> <22327@cbmvax.commodore.com>
Organization: NCR UK Software Services, London
Lines: 36

[stuff deleted]

>> Can anyone out there tell me were I could get a cable that would work,
>> or baring that, the pinouts on the NCR SCSI interface so I could
>> build the proper cable?

>The connector on the NCR thing should be the standard 50-pin Dual in-line
>header connector.  You should be able to get a standard adapter cable
>for this, assuming the MV3100 has standard SCSI?

[stuff deleted]

Just for info., there are two distinctly different SCSI interfaces, single-
ended and differential.  These are different electrically (voltage levels
essentially), but LOGICALLY are the same.

Make sure your SCSI host is the same (i.e. diff. or single-ended), or you
could a slight funcrional impass (i.e. bang sizzle, sizzle).

Apart from that, there are 3 different connectors, but all have the same
signals.  SCSI A-connectros, B and C.

'A' connectors look crude to modern eyes - not very technical I know, but
    can't think how to describe them.  NCR don't use these anymore.
'B' connectors look like large centronics plugs.  NCR PC925/PC386 use these.
'C' connectors are like miniature 'd' connectors.  NCR System 3000's use
    these.

You can get 'B' to 'C' converter cables - we've got one.

Hope this is of some general use.
-- 
John A. Oxlade             Phone: +44 71 725-8820      Fax: +44 71 725-8374
Group Leader,              Email: john.oxlade@London.NCR.UK
DOS and OS/2 Support, SSD
NCR (UK) Ltd., 206 Marylebone Road, LONDON, NW1 6LY, United Kingdom.