[Coco] RE: Tandy Hard Disk Controller

[Mark Marlette]

You got the schematic Gene. It is not the way you are thinking.

Quoting Gene Heskett <gene.heskett at verizon.net>:

> On Monday 06 March 2006 09:46, Mark Marlette wrote:
>> In all of my years of working with SCSI on the CoCo. I have NEVER seen
>> a CoCo host adapter have a SCSI ID.
>>
>> For many reasons, it is not this simple.
>>
> Huh?  Should it not be address 7 on the old narrow buss?  How else could
> the drive notify it when the data is ready if a disconnect has been
> done?  Not that the disconnect has ever been used in the coco's
> versions.  It would seem rather pointless since the drive is waiting on
> the coco, not the other way around.
>
>> Quoting Mike Pepe <lamune at doki-doki.net>:
>>> L. Curtis Boyle wrote:
>>>>    I do know that Ken (of Kenton) had demoed an RS-DOS system at
>>>> Rainbowfest that did have 2 Coco 2's hooked up to one SCSI hard
>>>> drive... but I don't remember any of the details. I would presume
>>>> it would "just" be a driver issue.
>>>
>>> It's not a big deal. The drivers are very simple and shouldn't care.
>>> Really there are only a few things to worry about:
>>>
>>> 1- you need to be able to set each CoCo host adapter to use a
>>> different SCSI ID.
>>>
>>> 2- you need to maintain proper bus termination.
>>>
>>> and
>>>
>>> 3- you best not write to the same file(s) at the same time. Multiple
>>> reads should be just fine.
>>>
>>> Note that you can (technically) also wire up and share floppies in a
>>> similar manner.
>>>
>>>
>>> --
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>>> Coco at maltedmedia.com
>>> http://five.pairlist.net/mailman/listinfo/coco
>
> --
> Cheers, Gene
> People having trouble with vz bouncing email to me should add the word
> 'online' between the 'verizon', and the dot which bypasses vz's
> stupid bounce rules.  I do use spamassassin too. :-)
> Yahoo.com and AOL/TW attorneys please note, additions to the above
> message by Gene Heskett are:
> Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
>
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>