nesdev.org

Sorry again for the bump (has it really been 4 years?!?), but I released another new version of the screen saver this morning. The big news is that this release includes a Mac port along with the standard Windows version! The Mac version ended up taking a hilarious amount of time longer then I expec...

I see periodic "stuttering" in Nestopia (and some other emulators). It's not quite a Vsync issue from what I can tell, and it's very very hard to describe. It's fucking annoying and is one of the literal hundreds of reasons why I stick with XP. I ran into a similar problem with my emulato...

Watched the Gimmick video and really enjoyed it. I've played a lot of Gimmick and still learned quite a bit from your commentary ( e.g. I never knew about the secret room above the level 2 treasure. And I'm curious about your exact cannon timing technique.) Great job!

I do kind of get the "Sunsoft is overrated" sentiment - e.g., outside of the music I think Journey to Siius is terrible - but Gimmick! is really good and certainly worthy of a top 10 spot if not the overall #1 position. When you revealed #3, I wrote out your list and tried to rank some lik...

Wick + ee

Only 2 games left! I see a couple high-profile games still on the board, but in the end I think I know what the top 2 will be (one super-obvious, one a semi-darkhorse.) Can't wait to see if I'm right!

The superior sound, added to the reduced difficulty compared to the North American build, This is just not true. You obviously haven't compared both versions closely enough... Hmm, I played the North American version quite a bit and I remember the Japanese version being much easier. I only played a...

I'm really enjoying this countdown; almost every entry contains some details that I was unaware of. e.g. I had no idea that the premise of the Wai Wai World games was so cool. Keep up the good work!

blarrg's test were by far the most helpful thing for me, but there are a few things they do not catch. To snuff out some lingering issues, I would try to find games that did not work right from the get-go, i.e. games whose title screen wouldn't even come up, or would be glitchy, etc. Then I'd turn o...

I will look at all of the upscaling and graphics effects code again, but I think I have already optimized that code to the best of my abilities. In the meantime, here are some options you can try to speed things up: - The biggest thing is turning off all of the post-processing effects. - You can als...

I recently posted a new version of the screen saver that addresses the speed issue. After lots of code optimization the emulation core is nearly twice as fast as before. Not sure whether to be proud of the improvement or embarrassed at how inefficient the code used to be. :lol: There is also a new &...

You are correct. I actually screwed up the logging in Nintendulator, the real output is this: E421 EA NOP A:10 X:00 Y:00 P:21 SP:FB CYC:251 SL:-1 E422 EA NOP A:10 X:00 Y:00 P:21 SP:FB CYC:257 SL:-1 E2BC 06 20 ASL $20 = 10 A:10 X:00 Y:00 P:25 SP:F8 CYC:284 SL:-1 E2BE 8D 00 E0 STA $E000 = FF A:10 X:00...

This seems like a good place for some more MMC3 timing talk... I have been hammering away on MMC3 code and think I'm doing most things properly, but I've been struggling with the issue of IRQs and how soon they should be handled by the CPU after they are asserted. My current code handles an IRQ on t...

I've been trying to fix a lot of games that have been broken in my emulation code, and recently tracked down another hard-to-find bug that I'd like to make a note of in case anyone else encounters a similar problem. Back ~8 years ago when I wrote my input handling code for the standard controllers, ...

Slalom also requires proper handling of stack overflow, as I recently found out the hard way. About 5 seconds into the title screen, it issues a JSR operation when the stack pointer register is 0, so half of the PC goes on the bottom of the stack and half goes on the top. I was passing all of blargg...