Re: Re: DMA Sound split & Atari800

Re: Re: DMA Sound split & Atari800

[jingai]

> On Mon, 3 Apr 2000, jingai wrote:
> > I am trying to build Atari800 (the emulator) with sound support, and so
far
> > I have been successful, except that the output is very 'jittery.'  It
>
> Did it work before you applied the dmasound split patches?

Actually, I *believe* it didn't.  I honestly didn't get it to work at all
before applying the patches (I found the SIGNED_SAMPLES and
POKEYSND_BIG_ENDIAN defines after patching), but I did later on boot to
what I *think* was a kernel before the patches... I say "think" because I'm
not entirely sure I didn't overwrite that kernel with the new patched
kernel at some point during this whole process.. but I am fairly sure that
it probably would have worked the same, and that this problem has always
been there (ie, you didn't introduce it, AFAIK).. so it's either a problem
with the sound implementation in LinuxPPC or in Atari800... but, since
Atari800 is primarily developed for the Atari Falcon (m68k, I believe) and
not x86 (although x86 support is certainly more carefully monitored than
PPC I'm sure), I'm not entirely sure where the problem lies..

.ugh, sorry for the rambling.. I just got off work and it's 3am already so
you'll have to excuse me.. :)  But, if anyone who does know more about
kernel hacking than myself would care to make some attempt at building
Atari800 I would really appreciate it.. I could send the latest sources
(0.9.9h) plus the required roms to whomever is willing to try.

Regards,
Jonathan

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Re: Re: DMA Sound split & Atari800

[jingai]

> At 1:25 AM -0400 4/3/00, jingai wrote:
> >I am trying to build Atari800 (the emulator) with sound support, and so
far
> >I have been successful, except that the output is very 'jittery.'
>
> Do you know whether this behavior is unique on Linux for PowerPC?
> That is, does it also do it on x86?  It may just be a problem with
> the emulator; emulation of the sound chips on old computers is a
> tricky job.

I am assuming that this is not a problem with the x86 port, since the sound
support for UNIX is geared towards Linux on x86, and I have yet to read
such a complaint on the Atari800 mailing list..

> It could also be a bug in the emulator.  For example, it may be
> assuming that the sound chip has a buffer length similar to whatever
> is common on x86, causing it to screw up when it's in a different
> world.

That's what I am thinking, but as I said, I just haven't had the time to
delve much into the PPC sound stuff in the kernel... so I was just asking
for some help.. I may try again this weekend if I don't have to work, but
then my girlfriend would probably hate me even more :)  I'm already
spending a good 12-16 hours/day at work... (some advice for everyone:
never accept a job at a small company that's been around for 15 years, has
10 software products, and no current developers.. all of this ==
nightmares, headaches, lack of sleep, etc :)

-j

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