[hatari-devel] Chaos AD problem : $fffffc02

[Eero Tamminen]

Hi,

On maanantai 13 kesäkuu 2011, Laurent Sallafranque wrote:
> Thanks a lot Nicolas.
> 
> Another demo that runs now ;)
> 
> For me, it has freezed while showing the tridi DNT crew logo (near the
> end of the demo I guess).

For me it works to the end (there are still several screens after the
blue-white tridi DNT logo), when using the old UAE core.


> I agree, the sound is awfully noisy (one of the most noisy sounds I've
> heard under hatari).

Credits at the end say it's DSP sound.  :-)


> Le 13/06/2011 15:30, Nicolas Pomarède a écrit :
> > I committed a custom ikbd's handler for this demo. The 6301 code is in
> > fact used to decode the demo's protection (it will take a few dozen of
> > seconds, due to the slow transfer rate between cpu/acia and ikbd).
> > During the demo, the ikbd remains disabled, so you can't exit unless
> > you wait for the demo to end.
> > 
> > Hopefully, the demo doesn't uses the 6301's code that was supposed to
> > decode the byte. The 6301 code is using some kinds of 'sync decoding',
> > by relying on the 6301's timer counter and the instructions cycle
> > length.

At what frequency that timer is running, are you saying that it could
be using IKBD for synching the sound?


> > I guess they had too much trouble making this works, so the
> > decoder is much simpler (basically a XOR against an 8 bytes buffer)
> > and some part of the code are useless.
> > 
> > The demo is running correctly, except the sound which is really awful
> > (as a huge fan of Hardwired, I had to turn off sound instead of
> > listening to this :) )


	- Eero