nesdev.org

Indeed, aNESe seems to handle DMC IRQs perfectly. I'd like to check out your source but I couldn't find it anywhere on your site.

Disch mentioned Mig-29 and reminded me of the agony related to emulating that godforsaken game. :) I've been tinkering with it since the day I added the DMC but I still can't make it look like it does on a real NES. I've only got a PAL NES to test with though, I'm not sure exactly what glitches are ...

BT's "PPU Technical Operation" mentions something about garbage nametable fetches when the sprite patterns are being read, which implied that the HT counter was updated on cycle 256.

Yes, many mappers switch between the two, but I was referring to the UNIF mirroring flag.
I was just curious whether there was a purpose with this, but I guess somebody just made a mistake.

What's the point with having different flags for single screen $2000 and single screen $2400 in UNIF? I must have missed something cause it just seems so stupid.

Your emu is working fine. :) Got one tip for you though: It sounds like you are writing to a sound block while it's playing, causing distorted sound occasionally. Before flushing sound to the output buffer, check and see if the block you're writing to is currently playing. If so, sleep for a few mil...

Hyde: MMC4 is almost exactly like MMC2. Check the wiki.

I don't believe scanline-based or not should make much difference when emulating MMC2.

Judging from your pics, it still seems you're calling that hblank function during vblank. Otherwise, perhaps it's a PAL/NTSC thing?

Q's sync() way of implementing most mappers is probably best. Sometimes I wish I had done it like that. My mapper code is more like Nestopia's, which is pretty ok too.

This sets a PPU-internal palette pointer to 0. You should do this after a partial palette update, or Bad Things will happen to your background color PPU-internal palette pointer? Hmm, are you saying that this: lda #$3f sta $2006 lda #$10 sta $2006 would result in the sprite palette being used for t...

Hey, I think I remember that site design from OSWD "Autonomous" wasn't it?
Btw, I like how olafnes uses port 6502 for netplay
Keep it up

--Martin

> chunked format makes distribution of ROM patches harder?
You could just line up PRG0-9 + CHR0-9 and run an ordinary IPS on the resulting data.
Of course, this only works until you wanna patch anything other than the PRG/CHR data.

I haven't got an answer, but... I've been experimenting with mid-cycle writes myself but have not been able to come to any conclusion. Right now, I let PPU reads take effect on the first of the 3 PPU cycles, and writes take effect on the last one. It seems to work fine. I don't know how this works o...

If all you want to do is extend iNES to recognize mappers better, you might as well just start adding the board name to the end of the ROM (after all ROM banks). Some ROMs already have trash there (some store the game name there), but if a valid board name isn't found at the end of the ROM, the emul...

On the subject of rom formats, I always thought it would be a nice feature to keep battery-backed RAM within the rom file itself, so you don't have to copy .sav's from one emulator's folder to another. Am I the only one who would like this? I've been thinking the exact same thing, cause that's how ...