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From: neese@adaptx1.UUCP
Newsgroups: comp.periphs.scsi
Subject: Re: Maxtor 8760S SYNCHRONOUS w/Adaptec
Message-ID: <283400120@adaptx1>
Date: 21 May 91 18:31:45 GMT
References: <10803@unixland.uucp>
Lines: 27
Nf-ID: #R:unixland.uucp:10803:adaptx1:283400120:000:1416
Nf-From: adaptx1.UUCP!neese    May 20 09:35:00 1991


>>Bill, if you are talking about the window that displays the INQUIRY data
>>and shows all the options available, this doesn't mean the drive will not
>>support the sync message.  In some interpretations of this data, the vendor
>>may think that this bit means the peripheral has the ability to negotiate
>>for sync.  In this case, the Maxtor is correct.
>>If the window showing the 1542 settings show the device as running sync, it is
>>running sync.  No guess work here.  If you want to absolutely check, you need
>>to snoop on the SCSI bus.
>
>Yes, that's the window.  It's something like "show drive configuration"
>or something like that.  It shows "NO" for all of the possible parameters
>(except ANSI compliance).  I would have expected that it says "yes" for
>"SYNC TRANSFERS" ... So I guess that this point I don't know how to 
>determine whether the maxtor and adaptec card have negotiated sync
>communications.  Is this something that gets "set" and always works
>that way from then on, or does the negotiation occur on every transfer?

It is a set it once and forget it type of transaction.  The only other time
the 1542 will re-negotiate for sync transfers happens after a SCSI bus reset.
The host adapter window information will show what the adapter negotiated
for.

			Roy Neese
			Adaptec Senior SCSI Applications Engineer
			UUCP @  neese@adaptex
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