I suspect Battle City may be doing something important with unitialized RAM. I had noticed something unusual while testing Battle City inside of Project Nested inside of Mesen-S. It would hang after a game over, but if I went into Mesen-S's options and forced it to clear SNES unitialized RAM, then i...

PowerMappers says it has partial iNES 2.0 header support. That's where I would look next, maybe there could be invalid data in the headers of your ROMs, and the original PowerPak mappers aren't checking those bits. Hopefully it's as simple as that. May be a tough one to figure out otherwise, that's ...

Why are those frequencies an octave higher than the ones on nesdev wiki? Probably the lookup table is more trustworthy than the comments. You mentioning that kind of jogs my memory of me tweaking that table, and if I left the comments alone that wouldn't be too surprising. Now I wonder which games ...

There's the conversion lookup table from my old 2A03 emulator. The SPC has more choices for low frequencies, while the NES has more choices for high frequencies. In practice, the high frequencies don't sound much different from each other. ;===========================================================...

I started from the Colecovision (included the Atari 2600 module), Atari 7800, NES, Gameboy, SNES, then PC (386 IBM PS/1). PlayStation we used a ton of at my friend's house. I wanted an N64, I remember instead of getting one late I decided to get a Voodoo 3 card. Only weeks before 3XFX was bought out...

I think NROM and CNROM games would be portable to FDS, it's not necessarily easy though because it would have to be completely reassembled to work at different addresses. Any cart that uses PRG bankswitching is going to need some extreme modifications done to it, too much for anyone to really do in...

Nice, glad you got it to work. I was wondering of those pull-up resistors would be contributing to the '670 running warm. Depends on the resistance I guess. 74C, HC, HCT, AC, ACT parts run very low power. But 74'670s never came in that variety - the best you get is 74LS. And LS and other older famil...

See Ben Boldt's post. Kingworld is said to sell one, though I can't personally confirm that it's 2.5mm, nor how well it fits into an NES-101.
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It seems usual for games to be factory-converted to other games, I had an SMB3 label fall off and expose an SMB2 label beneath it. And my Rad Racer cart has WRAM that goes unused, could have been converted from Metroid. However, it also says that it's not in the same group as Rad Racer 2 and Gauntle...

Seeing the code helps, but it's incomplete, as ReadJOY appears to be a macro. For now I'll have to make assumptions about what it expands to, but that could lead us down the wrong path. I use the "bne" at the begning of each loop to stuck in a loop when the control is pressed Pos2Loop: Rea...

You have the button status of the current frame, but you also need to keep the button status from the previous frame. Before JOY is updated (but after you've used it for that frame), copy JOY into a new variable like JOY_OLD or something. If you want to detect only the transition into each "new...

1. The reset button doesn't work at all. No response from it whenever the button is pushed. It doesn't matter if I push the button from the outside or take off the lid and push it from the inside. And the ebay listing said that the console worked perfectly... Any ideas on how I can maybe fix this? ...

Check out MrNorbert1994's NSF archive, it's the best NSF archive I know of (by far), and is also frequently updated. https://twitter.com/MrNorbert1994/status/640137889809080320 (direct link) https://www.mediafire.com/file/wet646wm0hbybwt/NSF.rar/file In the copy I have here (a little outdated), the ...

By the way, I don't have the expansion audio mod, sadly (I really should: wasn't there some sort of hardware device that could plug into the bottom of the NES to avoid the need for a mod?), and the ROMs I'm using are unhacked and match known good dumps. Yes, INL designed that audio expansion enable...

For NSFs at least, maybe NSFE? You can define a playlist. If you want it to show up as a file with only one track, the only way to do it will be to modify the init code in the rip. Almost always, the person doing the rip has to add some code in to re-order the tracks, and a lookup table with the tra...