[Coco] 1.2 mb floppy

[Darren A.]

>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/>

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