Update to bsnes v042r03? release.

I mentioned I wouldn't be posting a new WIP for a while so that I
could work on something in secret. That way in case it didn't work
out, nobody would be bummed out. Imagine my surprise when it only took
me two days to get this far ...

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(I removed the title-bar text for the sake of the screenshot
aesthetic. Check the WIP yourself if you don't believe it.)

Kirby's Dream Land 3 and Dragon Ball Z: Hyper Dimension are fully
playable. Note that most games aren't playable, and most of the chip's
added features are missing.

Speed took a ~3-5% hit for non-SA1 games due to all the new co-
processor thread synchronization primitives that you can't really hide
from inlined, super-intensive sections of the scheduler code.

As of now, and this will change, SA-1 games run about ~60% slower than
normal games. Meaning you'll really want at least an E4500, but
preferrably an E8400; and no filters.

The most impressive part is that I emulate this at the bus/clock
level. Meaning if both the S-CPU and SA-1 access RAM at the same time,
they'll see the changes and stay perfectly in sync. I even emulated
the bus conflict resolution of the SA-1 memory controller. So in terms
of accuracy, this is akin to the cycle-level S-PPU. It's the
"theoretical worst case" for the most processor-intensive, lowest-
possible emulation achievable.

I believe it was _Demo_ who speculated that it'd take at least a 10GHz
processor to achieve this. Then again, it's been so long I could be
attributing the quote to the wrong person. Don't even remember the
exact words anymore. Anyone recall?

This gives us insight into the kind of performance we can expect from
the cycle-PPU (also runs at 10.74MHz) and SuperFX. For SA-1+cycle
S-PPU, it would appear that there is no processor on the market that
can maintain full speed with that combo yet, heh. By the time I get
around to S-PPU, there most likely will be though.

Lastly, don't bug me about SuperFX support because of this. This SA-1
support is a simple subclass of the core S-CPU that already existed in
cycle-perfect, bug-free form; plus a memory mapper and ALU. Lots more
to go, and even then, this is easily multiple times less work than the
SuperFX is going to be.

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This commit is contained in:
byuu
2009-04-07 13:14:00 +00:00
parent f3d1d10d3e
commit 4c92d11d80
Update to bsnes v042r03? release.

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