[Coco] Good news: my CoCo 3 is back to life!

[Mark Marlette]

Joel,

MB8877A was a 5v drop in replacement for the +12v WD1793, otherwise  
you would need a MPI for that device.

SY6591...that is it...No datasheet on that one at Cloud-9's repositiory... :(

I knows there was a mod for the J&M to work on the CC3.

Mark

Quoting Joel Ewy <jcewy at swbell.net>:

> L. Curtis Boyle wrote:
>> On Mon, 05 Mar 2007 08:31:49 -0600, Boisy Pitre <boisy at boisypitre.com>
>> wrote:
>>
>>> Gents,
>>>
>>> Not to put too fine a point on it, but FD-500 controllers will also
>>> work at 5v.  I think it's a very older, specific model number of disk
>>> controller that requires 12v and hence, the MPI.
>>>
>>> Boisy
>>>
>>
>> The very old, full size controllers that came with original full
>> height, really long grey 35 track single sided drives were the 12V
>> controllers.
> FWIW, I have a 26-3029, a 26-3129, a J&M (says JFD-COCO rev.A on the
> PCB), a Disto Super Controller, and a couple Super Controller IIs.  They
> all work on the CoCo 3 without an MPI.  (And none of them are an FD-501
> :) )  My 3029 has an MB8877 FDC with a WD9216 data separator.  The
> controller in the J&M is an SY6591.  All the rest use the 28-pin WD1773.
>
> Mike Pepe notes in an email on this list on 8/2/06 that the original
> controller (the one that required 12V on the bus) was the 26-3022.  So
> that should be the only one you would need to plug into the MPI to use
> with the CoCo 3.
>> Ironically, the only ones that could properly handle hi-density (1.2
>> or 1.44 MB) drives with some modifications to the controller.
>>
> This fall Mike Pepe modified his  3029 for high-density and posted a few
> messages about it on this list.  Last I recall he still needed to
> finalize the software/firmware modifications.  His notes are here:
> http://www.doki-doki.net/~lamune/computers/coco/hd-floppy/
>
> JCE
>>
>> --L. Curtis Boyle
>>
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