[Coco] 1.2 mb floppy

[Gene Heskett]

On Friday 11 May 2007, Darren A. wrote:
>>From: Gene Heskett
>>Subject: Re: [Coco] 1.2 mb floppy
>>Date: Fri, 11 May 2007 22:34:47 -0400
>>
>><snip>
>>
>>This is almost correct, the 1.2 meg is done by a combination of speeding
>>the
>>drive up to 360 rpm from the normal 300, and doubling the baud rate to/from
>>the media to 500kb/second.
>>
>>Its this last that the coco can only do with one controller, and it has to
>>be
>>modified quite a bit.  The original one that needed 12 volts too is the
>>only
>>one.  So on a coco3, it has to be run in an MPI in order to get that 12
>>volts.
>
>-
>
>This is not quite true. One person on this list has successfully modified
>the 26-3029 controller to do 500kb/second. This was the second version of
>the Tandy Controller. It was 5-volt only and used the MB8877A FDC chip.  You
>can see the details about this modification at:
>
><http://www.doki-doki.net/~lamune/computers/coco/hd-floppy/>
>
I'd forgotten about that, thanks for the reminder.


-- 
Cheers, Gene
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