[Coco] CoCo Hard Drive History

[Gene Heskett]

On Sunday 13 October 2013 20:23:41 Bob Devries did opine:

> Gene, I have two SCSI (Quantum) drives hanging off my Disto 4-in-1 and
> they work flawlessly.
> 
Did you do that by making up a jumper and connecting the center pins of the 
drives together?  Thats the pins the drive use to talk to each other so 
they can share the interface, and which Tony's std cable does not connect.

I was tempted to do that but never quite found my round tuit.  I bought a 
TC^3 instead, which does work flawlessly.

> Regards, Bob Devries
> Dalby, QLD, Australia
> 
> ----- Original Message -----
> From: "Gene Heskett" <gheskett at wdtv.com>
> To: <coco at maltedmedia.com>
> Sent: Sunday, October 13, 2013 7:10 PM
> Subject: Re: [Coco] CoCo Hard Drive History
> 
> > On Sunday 13 October 2013 05:09:32 tonym did opine:
> >> >---- Original Message ----
> >> >From: "Greg Law" <glaw at live.com>
> >> >Sent: 10/13/2013 1:59:03 AM
> >> >To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> >> >Subject: Re: [Coco] CoCo Hard Drive History
> >> >
> >> >From: tonym
> >> >
> >> >> Are these WD SASI-to-MFM boards similar to the controller boards
> >> >> used in the Kaypro 10?
> >> >> Or is that a different board? I think those were WD1002-HD0?
> >> >
> >> >Yes, exactly the same as used in the Kaypro and a bunch of other
> >> >computers at the time. The WD1002-HDO is the same board as the
> >> >WD1002-05, except the -HDO does not have the floppy controller
> >> >components. Hence, HDO is hard-drive only.
> >> 
> >> Looked them up, and the datasheets.
> >> 
> >> The WD1002-05 and WD1002-HDO are NOT the same as the WD1002-SHD. the
> >> -SHD is SASI, and the -05 and -HDO are some host bus. even the block
> >> diagrams are different, and the -SHD datasheet mentions SASI and the
> >> commands supported.
> >> 
> >> Looks like the Eliminator supporter the same WD1002-HDO as the Kaypro
> >> 10...
> >> 
> >> SO my other question remains...
> >> 
> >> Do the Disto 4-n-1 and HD II support a SCSI HDD attached directly, as
> >> opposed to going MFM?
> > 
> > Yes, but it was a single drive only, Tony's interface was missing too
> > many signals that would have allowed 2 or more drives to co-exist.
> > 
> >> --
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> >> Coco at maltedmedia.com
> >> http://five.pairlist.net/mailman/listinfo/coco
> > 
> > Cheers, Gene
> > 
> > Rome was not built in one day.
> > -- John Heywood
> > A pen in the hand of this president is far more
> > dangerous than 200 million guns in the hands of
> > 
> >         law-abiding citizens.
> > 
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> 
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco


Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)

When does summertime come to Minnesota, you ask?  Well, last year, I
think it was a Tuesday.
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
         law-abiding citizens.