[Coco] CoCo Hard Drive History

[Tim Fadden]

On 10/13/2013 2:10 AM, Gene Heskett wrote:
> 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.

Not true.  I have 2 drives attached to mine.  The only signals missing 
that could tell were extra ground lines.

Tim

>>
>>
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> http://five.pairlist.net/mailman/listinfo/coco
>
> Cheers, Gene