Re: Apple2 USB Stick interface with Vinculum chip

[mdj <mdj.mdj@gmail.com>]

On Apr 28, 6:57 pm, "RedskullDC" <R...@oz.org> wrote:

> > I suppose it would make it easier to ship HD images from emulators to
> > the target media, but considering the massive increase in complexity,
> > it doesn't really seem worth it. Particularly since the design seems
> > to indicate all this work would need to be done by Apple II firmware,
>
> The FAT filesystem is actually handled by the firmware on the Vinculum chip
> itself.http://www.vinculum.com/documents/fwspecs/DS_VNC1L_FW_VDAP.pdf
>
> It presents a simple stream based interface, with File Open/close,
> read/write, position
> commands.
> It also has a lower level block read/write access.
>
> If I stick with using a 32MB prodos image under FAT, it wouldn't be too
> difficult to convert the block number in prodos read/wirte calls into a file
> offest
> on the FAT side and simply read/write the data that way.

Ah! I see. Yes, that would simplify things a bit :-)

> > it seems somewhere between unlikely and impossible to handle reading/
> > writing an image off a FAT filesystem.
>
> ???
> GSOS does it already with MSDOS.FST

Yep. Serves me right for shooting my trap off - I didn't realise the
Vinculum module already presented a FAT abstraction to the host.

Matt