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From: hcj@lzaz.ATT.COM (HC Johnson)
Newsgroups: comp.sys.atari.st
Subject: Re: Connecting 2 hard drives
Summary: change one to be address 1
Keywords: megafile30 ICD 30
Message-ID: <786@lzaz.ATT.COM>
Date: 18 Sep 89 14:52:47 GMT
References: <3114@cveg.uucp> <2971@tahoe.unr.edu> <2972@tahoe.unr.edu>
Organization: AT&T ISL Lincroft NJ USA
Lines: 39

In article <2972@tahoe.unr.edu>, mikew@wheeler.wrcr.unr.edu (Mike Whitbeck) writes:
> I have 2 ST's one has a megafile30 the other has an ICD 30M
> drive (seagate with SCSI ). I would like to do a one time
> transfer of LOTS of programs/data between the two. 
> 
> The manual for the megafile30 says I have to open the case to
> change its drive #'s and that would void the warranty. The ICD
> did not come with a manual. The ICD has both a DMA out and SCSI
> out ports (daisy chain). 
> 
> 	I'm thinking that I should plug the ICD
> in to the ST's DMA as drives C-D-E ; open the megafile and
> change the dip switches (but to what I don't know)
> to make it F-G-H and plug it into the DMA port on the ICD.
> 
> So waddya think? Anyone know? 
I do this all the time using a BMS200 and an SH204

1. yes change the megafile to device address 1.
  -- in spite of the words, this cannot void your warantee, or they wouldn't
     have put the switches inside.  
2. with the ICD first, you are hoping that their DMA OUT will work properly.
  -- BMS200 does, some others dont.
3. re megafile:  you may not know which end of the three switches is bit 0:
	as in bits:  2  1  0

	if you change bit 0 to a 1, you get address 1.  
	if you change bit 2 to a 1, you get address 4.

	as long as the ICD DMA out works, you will get both drives if you 
	address it as 1.  If 4, you wont (the driver stops after finding
	no controller).  Guess about bit 1, try it.  If it fails, set it 
	back, and try the other end.
4. good luck

Howard C. Johnson
ATT Bell Labs
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