[comp.sys.amiga.hardware] SCSI-to-SCSI instead of NULL modem

d8sunch@dtek.chalmers.se (Christer Sundin) (03/05/91)

Is it possible to connect two Amigas via SCSI interfaces with a
simple cable? That would be a _LOT_ faster than a null modem!

Does it have to be some sort of clever device in between?
I would suppose so :-(

Just my $0.02 worth!

Regards, Chris.
--
     _       |      Christer Sundin      |      d8sunch@dtek.chalmers.se      |
    //       |----------------------------------------------------------------|
 _ // Amiga  | The sun is the same in a relative way, but you're older        |
 \X/ Forever | Shorter of breath and one day closer to death...  (Pink Floyd) |

lshaw@ccwf.cc.utexas.edu (logan shaw) (03/06/91)

In article <1991Mar4.233245.27431@mathrt0.math.chalmers.se> d8sunch@dtek.chalmers.se (Christer Sundin) writes:
>Is it possible to connect two Amigas via SCSI interfaces with a
>simple cable? That would be a _LOT_ faster than a null modem!

Actually, I believe I've heard that the Trumpcard Pro has this capability
built-in.  It is also supposed to be part of the SCSI standard (device ID 7
is reserved for this), though I don't know that it's implemented on all
controllers.

Anybody with different controllers that knows about this want to speak out?
I've got a GVP and the new software and ROM upgrade doesn't mention it.

>Does it have to be some sort of clever device in between?
>I would suppose so :-(

Actually, I think all you would need is a cable.

>Just my $0.02 worth!

-- 
     =----------------------------------------------------------------=   |
/\/         Logan Shaw         "Come to Me, all who are weary and        -+-
\/\  lshaw@ccwf.cc.utexas.edu   heavy-laden, and I will give you rest."   |
     =----------------------------------------------------------------=   |

garyf@wiis.wang.com (Gary Field) (03/08/91)

d8sunch@dtek.chalmers.se (Christer Sundin) writes:

>Is it possible to connect two Amigas via SCSI interfaces with a
>simple cable? That would be a _LOT_ faster than a null modem!

>Does it have to be some sort of clever device in between?
>I would suppose so :-(

The cable is the easy part! :^)

The main obstacle to overcome is that you need to create a SCSI driver
that will allow one of the Amigas to act as a target device. This cannot
be done via the C= scsidirect interface so you would need to talk directly
to the SCSI controller chip (which ever one your host adapter uses).
This is quite possible, yet I have never seen it done on any system 
(Amigas, Unix, PCs, minis).

Go to it!!!

P.S. When you get it done by all means send me a copy, I'd love to be
able to transfer stuff that way.

Gary

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874226@watt.usask.ca (Shawn Switenky) (03/09/91)

I think that C-Ltd had a product which allowed you to connect up
two Amigas across the scsi port and share the devices between the two.

Shawn Switenky
874226@watt.usask/ca

lcc727@unhd.unh.edu (Layton C Cote) (03/12/91)

In article <47025@nigel.ee.udel.edu> 874226@watt.usask.ca (Shawn Switenky) writes:
>I think that C-Ltd had a product which allowed you to connect up
>two Amigas across the scsi port and share the devices between the two.
>
>Shawn Switenky
>874226@watt.usask/ca

FINALLY!   I have been searching for something like this for a long time,
or at least how to build one.  HOW MUCH does this little cable run.  
Would it work fine transferring data between 2 3000's with fast
quantum 210M drives?   Thanks for the info!!!

-Layton
lcc727@unhd

rich@documail.UUCP (Rich McCallister) (03/18/91)

In article <47025@nigel.ee.udel.edu>, 874226@watt.usask.ca (Shawn Switenky) writes:
< I think that C-Ltd had a product which allowed you to connect up
< two Amigas across the scsi port and share the devices between the two.
    They did have such a product.  It had some problems, tho, operating with
the AmigaDOS in-RAM maps of modified blocks. This made it unsafe to allow
two Amigas to write to the same partition of the same disk. "SCSI-Net", I
think it was called. I bought a C-Ltd controller, in hopes of using SCSI-Net
someday.
    Several months ago, I talked to a fellow at the firm that now handles
Kronos controllers (Micro-Dyn, Inc., of Witchita, Kanasas).  When I asked
him if I could use SCSI-Net to connect a Kronos controller and an older,
non-DMA controller, he said yes; but he warned me that there were so many
restrictions to its use that I would probably not like it. He claimed there
was only one place he knew of where SCSI-Net was in use, and that was by
the folks who developed it (apparently, not at Micro-Dyn). He seemed to 
prefer to not sell me a Kronos controller, rather than selling it to me
under the assumption that I would use it with SCSI-Net.