[Coco] CoCo Hard Drive History

[Gene Heskett]

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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Cheers, Gene
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