On Mon, 12 Jan 2009, a2aviator{at}gmail.com wrote:

> I have been supporting a system that has been in place since 1985,
> that works on a modified DOS on a Corvus OmniDrive.
>
> The kicker, it's not just normal DOS 3.3, it's highly tweaked to get
> more than 35 tracks of space per volume.  A modified RWTS uses two
> actual volumes as one- instead of accessing 16 sectors, it does 32.
> Sectors higher than 16 are mapped the to the next volume.
>
> So a storage space equal to two volumes is available for a single
> random access txt file.
>
> The application itself is written in Applesoft BASIC, and doesn't fit
> in the ProDOS memory space.
>
> I'm trying to have a failsafe environment to fall back on if I can't
> get any more Corvus Omnidrive parts, while they migrate off this onto
> something else.
>
> That migration was supposed to happen this week, but it's been put off
> due to shenanigans from the software vendor hawking the Windows stuff,
> keeping adding more fees to stuff and saying it can't do stuff that
> they said it can.
>
> This system as placed in use in 1985, in DOS 3.3, and has been
> chugging along ever since.
>
> Ideally, an emulator would be OS X based, though since I know of all
> of those.. and none do it.. essentially, Sider emulation.. and heck,
> if I needed to I could probably move this guy onto a Sider, I have a
> few of those. But that would loose the multiuser bit for the time
> being.

http://usotsuki.info/udos.zip

Any emu that can do hard drives should be able to support 800K from one of 
these, it does INIT just like DOS 3.3, and everything.  This disk image is 
a regular floppy though.

-uso.
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