Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!bellcore!wrath!braun
From: braun@wrath.bellcore.com (David A. Braun)
Newsgroups: comp.sys.amiga
Subject: Re: A1000 SCSI HD
Message-ID: <18789@bellcore.bellcore.com>
Date: 11 Jan 90 14:06:01 GMT
References: <6402@ucdavis.ucdavis.edu>
Sender: news@bellcore.bellcore.com
Reply-To: braun@thumper.bellcore.com
Distribution: usa
Organization: Multimedia Communications Systems Research Group (Bellcore)
Lines: 31

In article <6402@ucdavis.ucdavis.edu>, auyeung@iris.ucdavis.edu (Tak
[UlTech] AuYeung) writes:
> Okay, after more than 2 months of thinking (and thinking), I've
> decided to install a HD system for my good old Amiga 1000.
> 
> This is my plan:
> (1)	Buy a Supra SCSI controller for $209
> (2)	Buy a 49M Seagate HD for $349
> (3)	Buy a box with power supply and fan for $79
> (4)	Piece them together
> 
>	....
> 
> Thanks in advance!
> 
>	....
>

This is essentially what I did and it works fine.  A point to consider though
is that the Supra 4X4 controller (thats what is printed on the box) is
just the SCSI controller chip (5380?) (that just about everyone uses) and
some glue chips to interface its pins to the Amiga's bus.  There is no DMA
capability.  There seems to be some interupt hardware but the software doesn't
use it (Xoper doesn't show anyone on the vector).  This is fine if all your
want is Supra controlled hard disks and single thread processing during
disk operations.  Problems arise when you start trying to use other SCSI
devices.  The interaction between Supra's stuff and the "foreign" stuff can
get really bizarre!

dave braun
(201)829-4493