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Article #39

Re: SCSI (was Re: IPI-2 questions)

#39
From: Bernd Felsche
Date: Sun, 26 Jul 1992 05:24
22 lines
1690 bytes
In <AJC.92Jul24120000@thendara.pa.dec.com> ajc@pa.dec.com (AJ Casamento) writes:

>  The size of the transfer is started at 8bit, but can go to either 16bit or
>to 32bit. This would mean that the architectural limit in the current spec
>for Fast Very-Wide (ie. 32bit) Differential SCSI-2 would be 40MB/s. As I read
>the current spec the use of 16bit requires two SCSI cables to be used. So, it
>would seem possible (and the spec states it is) to mix 8bit and 16bit devices
>on the same bus using a Host Adapter that was capable of handling 16bit.

How do you prevent two devices responding to the same
low 8-bits of address?

i.e. devices 4 and 12.

The high bit is only visible on the 16bit bus. Is there some
magic which differentiates between 8 and 16bit addresses,
which is visible in the 8bit space?
-- 
+-----+ Bernd Felsche                     _--_|\  #include <std/disclaimer.h>
| | | | MetaPro Systems Pty Ltd          /      \ bernie@metapro.DIALix.oz.au
| | | | 328 Albany Highway,              X_.--._/         Fax: +61 9 472 3337
|m|p|s| Victoria Park, Western Australia 6100  v        Phone: +61 9 362 9355
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Message-ID: <1992Jul26.052449.18091@metapro.DIALix.oz.au>
Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!uniwa!DIALix!metapro!bernie
References: <BrCG6x.Jpp@acsu.buffalo.edu> <ADAMS.92Jul16014945@PDV2.pdv2.fmr.maschinenbau.th-darmstadt.de> <BrH2sz.5qM@csn.org> <22020@venera.isi.edu> <AJC.92Jul24120000@thendara.pa.dec.com>

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Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!uniwa!DIALix!metapro!bernie
From: bernie@metapro.DIALix.oz.au (Bernd Felsche)
Subject: Re: SCSI (was Re: IPI-2 questions)
Message-ID: <1992Jul26.052449.18091@metapro.DIALix.oz.au>
Organization: MetaPro Systems, Perth, Western Australia
References: <BrCG6x.Jpp@acsu.buffalo.edu>  <ADAMS.92Jul16014945@PDV2.pdv2.fmr.maschinenbau.th-darmstadt.de>  <BrH2sz.5qM@csn.org> <22020@venera.isi.edu> <AJC.92Jul24120000@thendara.pa.dec.com>
Date: Sun, 26 Jul 92 05:24:49 GMT
Lines: 22