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From: jesup@cbmvax.commodore.com (Randell Jesup)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Need help with my 2091
Message-ID: <17308@cbmvax.commodore.com>
Date: 9 Jan 91 21:48:39 GMT
References: <91Jan7.103150est.8481@orasis.vis.toronto.edu>
Reply-To: jesup@cbmvax.commodore.com (Randell Jesup)
Organization: Commodore, West Chester, PA
Lines: 41

In article <91Jan7.103150est.8481@orasis.vis.toronto.edu> culhane@vis.toronto.edu (Sean Culhane) writes:
>   1) In 2 days I'll have a second hard drive (Quantum 105 Prodrive) to add
>      to my 2091 (my original drive is in one of the 3.5" bays, and I'll be
>      putting the new drive on the 2091 itself).  My questions is: do I 
>      have to run a cable from the outside of the Amiga to the second drive 
>      or can I daisy-chain the two drives within the Amiga itself???  If so,
>      how do I daisy-chain them?? (the 2091 only has one place for a 50 pin
>      ribbon cable ... do I need some sort of pass-through cable adapter???)
>      If not, do I just need a standard 25-50 pin cable???  Please excuse my 
>      ignorance if this question seem naive to you.

	You can put the new 3.5" drive in the 5.25" bay (make or get brackets
to fit 5.25" rails, or leave it loose until then).  You may need a power-
splitter to get power to it.  As for cabling, add a second connector to the
scsi cable and plug it in.  Note that only the last SCSI drive in the chain
should have the resistor packs installed (though it'll work over-terminated,
it isn't really good to leave it that way).  These are the socketed resistor
packs right by the scsi connector.  If you mount it externally, you'll need
some sort of 25->50 pin connector, as well as a case/power supply.  There
are Mac 25->50 pin centronics connectors easily available, then wire up a
centronics 50-pin to the 50-pin dip.  Leave the terminators in on the last
drive outside the case again.

>   2) It was pointed out to me that several months ago there was some 
>      discussion in c.s.a.h that the 2091 might have some problem handling
>      more than 1 drive.  Could somebody please summarize the main points
>      of this discussion for me.  If it's any help, the ROMs on my 2091
>      read V5.92.

	You may find it useful to turn off reselection for the drive when
you set it up with hdtoolbox (define drive type).  You may have to turn off
reselection on the other drive as well - careful, this wipes your partitioning
information, which you then have to reenter exactly the same as it was before
saving the changes to the drive.

-- 
Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com  BIX: rjesup  
The compiler runs
Like a swift-flowing river
I wait in silence.  (From "The Zen of Programming")  ;-)