[Coco] Dragon & Drivewire

[Aaron Wolfe]

On Oct 13, 2012 7:52 AM, "Ken H." <dragon.atv at gmail.com> wrote:
>
> Aaron,
> The Dragon's PA1 Tx line is internally inverted. Phill's Dragon parallel
to
> bitbanger adapter design includes a level shifter and an LS04 to invert
the
> signal again.
> The hardware design could be simplified if it would be possible to have
the
> Drivewire server handle the inversion of the output signal coming from the
> Dragon.
>
> Do you think it would it be possible to add a "Dragon Tx Invert" option to
> the Drivewire server code?
>

If that means xor the data bits, sure.  We already flip bit order and some
other things for 230k mode, so there is an existing interface to support
transformation of the data.  If we also need to change level of start
bits..hmmm I don't think its possible in software..?  But I'm no serial
guru.
If it can be done, happy to do it.

>
> On Sat, Oct 13, 2012 at 1:27 PM, Aaron Wolfe <aawolfe at gmail.com> wrote:
>
> >
> >
> > Nope.  All requests in DW use LSN, just linear sectors from 0 to
> > whatever.  There is no concept of tracks, sides, etc.  Sorting that
> > type of thing out is the responsibility of the CoCo side driver.  If
> > there is a restriction to 35 track disks in DECB, that's something
> > imposed by HDBDOS's DW driver.  Probably because of the multi-disk
> > partition scheme they need to all be of identical size.
> >
> >
>
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