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PostPosted: Sat May 30, 2015 8:13 pm 
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Joined: Wed Mar 31, 2010 12:40 pm
Posts: 207
Hi All,

I posted this in the #nesdev channel, but I think it got lost in the noise. I don't know what the rules surrounding modifying the wiki are, but I believe this sort of thing would be a fine addition. Basically, the evaluation process as described in the wiki was hard to verify an emulator against. You could be 90% sure that you're doing it right, but no real way to verify that.

So I went ahead and generated what I believe are the 3 most useful contexts the evaluation can run in:
- 1 sprite on the raster. This would help to verify that the empty sprite slots do indeed contain sprite #63's y-coordinate, then $ff for the rest of the fields.
- 8 sprites on the raster. This verifies that the buggy behavior kicks in and is simulated properly, as well as writes being turned into reads.
- 9 sprites on the raster. This verifies that after the 9th sprite is found, the buggy behavior ceases.

I have these logs hosted here. The file "OAM - Simulation Cases" describes the context that the evaluation process is running in.

Using the logs referenced above, I was able to verify very rapidly that my emulator matches the expected output. However I did note that V:261 did give different patterns, so I'll need to investigate that more before I make logs for that line.

PS: The logs were generated using Visual2C02.


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PostPosted: Sun May 31, 2015 6:09 pm 
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Joined: Sun Sep 19, 2004 9:28 pm
Posts: 3192
Location: Mountain View, CA, USA
beannaich wrote:
I don't know what the rules surrounding modifying the wiki are, but ...

Semi-off-topic, but: it's a public resource editable by anyone, i.e. there are no real "rules" other than "don't be a dick". If you don't already have a Wiki account, create one + let me or Tepples or any other moderator know in a PM the username and we'll mark it as edit-capable so you can improve things at your own behest.


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