[Coco] noswiz doesn't work for me...

[Ciaran Anscomb]

Brett Gordon wrote:
> 
> CoCoBoot (and BASIC) is hanging on xroar anytime it writes to the
> 0xff50-0xff57 region of the io space.  CoCoBoot is trying to find an
> IDE harddrive there.   Xroar reports a "WD2793  bad command error".
> I'm assuming xroar is putting a FDC controller there (rather than at
> 0xff40 ?)

For RSDOS, I have A3 set = FDC IO, A3 clear = latches (drive select, etc.),
with A0/A1 selecting the FDC register.  But I worked purely from schematics
found on the web, I can't see anything to indicate that A4 is used for
addressing (so 0xff50-0xff5f will shadow 0xff40-0xff4f).

> It beleive this is the problem as CoCoBoot boots with
> no problems without an IDE controller on a real CoCo2 or CoCo3, and on
> Mess.   I'll keep dabbling an see if there's a work-around.

This implies there must be something going on though I'm not aware
of - hmm!  Let us know if you find anything...

..ciaran