Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!cs.utexas.edu!uunet!portal!cup.portal.com!Henry_Burdett_Messenger
From: Henry_Burdett_Messenger@cup.portal.com
Newsgroups: comp.sys.atari.st
Subject: Re: Where can I get: (a) 1.4 TOS (b) SCSI adaptor???
Message-ID: <20921@cup.portal.com>
Date: 1 Aug 89 21:40:30 GMT
References: <HARRY.89Jul31195726@marvin.moncam.co.uk>
Organization: The Portal System (TM)
Lines: 50

> Secondly, I have a Quantum 60 (100?) MB Hard Disk with embedded SCSI
> that I want to use.  I've heard that Adaptec make a controller to
> go to SCSI; what's its number, and where (pref. UK) can I get it
> (how much?).  Also, the Supra HD software seems like a good thing
> to get; again, where from and how much?

	You don't need a SCSI disk controller with an embedded
	SCSI drive. 

	+--------+
	|     DMA|---->[DMA/SCSI]=====>[SCSI disk drives]
	|   ST   |
	|        |
        +--------+

			    and/or

	+--------+
	|     DMA|---->[DMA/SCSI]=====>[   SCSI   ]++>[ST506 drives]
	|   ST   |                     [controller]
	|        |
        +--------+

	Since your disk drive already speaks SCSI, you won't need
	an Adaptec (4010, 4070) or Xebec (S1410) controller. SCSI
	controllers are for old-style ST-506 drives like Seagate
	ST-225s. 

	What you _will_ need is a DMA/SCSI adaptor. There are a 
	couple: one made by Berkeley Microsystems and one made 
	by Supra. Both come with a battery-powered clock to 
	set the ST's time at power-up.

> Thirdly, can I hang other devices off the SCSI?  Someone said that you
> could get more than one *hard* disk going because of the way the Supra
> driver deals with them; would it handle other SCSI devices in the same
> way, or would another driver be needed (assuming it's at all doable)?

	You can add up to seven SCSI disk drives or SCSI controllers.
	Most SCSI controllers support 2 logical units, so you could
	connect up to 14 winchester disk drives to your ST.

>   Harry Fearnhamm,         EMAIL: harry@moncam.co.uk
>    Monotype ADG,                  ...!ukc!acorn!moncam!harry
                                                                        
				- hbm
-------------------------------------------------------------------
Henry B. Messenger           henry_burdett_messenger@cup.portal.com
Digital Equipment Corporation isn't responsible for anything I say
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