13 Sep
2009
13 Sep
'09
5:48 p.m.
On Sun, 13 Sep 2009, dwight elvey wrote:
>> Do you have any Intel ISIS-II OS diskettes
available? I have a Series II
>> MDS-225.
>
> I'm trying to help Richard out with copies of my ISIS-II diskettes. The
> SD diskettes read just fine using imagedisk, but the DD ones use M2FM
> (aka MMFM) encoding and are not recognized.
>
> In researching this on the net, I'm seeing conflicting claims as to
> whether the Catweasel controller will make sense of this format. Does
> anyone know from personal experience that it will? If so, what software
> tools were required?
Hi Steve
Catwheasel should be able to read the bits. I have the spec
on the different special marks some place. I'm not sure
how it would be written back though. It can't be created
with any of todays controllers.
I'd be happy to simply write out a new disk from the Catweasel at this
point.
I'll keep an eye out for the clock/data spec but
it may take
me some time to find it.
It's in one of the Intel MDS manuals. Found some discussion of the format
and links to the docs on Herb Johnson's web site.
Steve
p.s. - If anyone with a Catweasel and the necessary programming skills is
interested in taking a crack at it, contact me privately and I will see
about lending one of the M2FM diskettes to experiment with. My MDS system
came from a university electronics lab and was accompanied with about 40
diskettes - projects and original masters.
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