[Coco] XRoar Accuracy (was: Introduction)

Sandro Mestre san.mes at gmail.com
Sat Mar 9 10:43:48 EST 2013


Awesome!

2013/3/9 Ciaran Anscomb <cocomalt at 6809.org.uk>

> Ciaran Anscomb wrote:
> > Jayeson Lee-Steere wrote:
> > > Following up on an earlier post of mine, I got hold of a USA Coco 1
> and a ran
> > > it with the Daggorath cartridge. It turns out that XRoar runs it, as
> best I
> > > can tell, perfectly. [...]
> > >
> > > Nice work Ciaran, the whole emulator is very well polished. (I'm still
> > > looking forward to hooking up the logic analyzer for my work though).
> >
> > Thanks!  It's shaping up...  There's still PAL CoCo timing to get right
> > (without reducing the HS to an infinitely short pulse!).  And probably
> > loads of other things too ;)
>
> ... which made for a good morning's work, and all before my first cup
> of tea!
>
> http://www.6809.org.uk/tmp/da/pal_coco_probe/
>
> So the deal is, slight difference in the positioning and duration of the
> VDG interruptions compared to the Dragon, and most importantly from my
> point of view (the bit of information I was missing) - the HS signal fed
> to the PIA is *inverted* (as well as continuing during the interruption).
>
> PAL-patched Dragonfire is go :)  If anyone wants to play, here's a
> snapshot build of XRoar with the fixes:
>
> http://www.6809.org.uk/tmp/xroar/
>
> ..ciaran
>
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