Interest in Teac FD235J drives and FC-1 boards?

[Chuck Guzis]

On 01/24/2018 02:35 PM, Glen Slick via cctalk wrote:
> On Wed, Jan 24, 2018 at 9:45 AM, Fred Cisin via cctalk
> <cctalk at classiccmp.org> wrote:
>>
>> Does ImageDisk or Teledisk support it?
>> If so, then with the ED controller and one of these drives from Chuck, you
>> could image things such as the "4 Meg" floppies from NeXT. (4M is the
>> UNFORMATTED capacity of the 2.8M disk, and NeXT marketing thought that "4M"
>> sounded better than the "2.8M" formatted capacity)
>>
> 
> The ImageDisk 1.18 source code is available to inspect to answer the question.
> 
> If there is something special that software needs to do to select a
> 1000K bps data rate I don't see anything in the ImageDisk code which
> does that. What does software need to do to select the 1000K bps data
> rate for 2.8M mode?

Yes, the intel 82077 datasheet should tell you all you need.  One aspect
is that if you're operating in 1Mb/sec mode, you need to set
perpendicular mode in addition to setting the 1M data rate, so not
altogether straightforward.

--Chuck