nesdev.org

Thanks for all the help!

One last question. Now that I would no longer interfering with the data going to the NES, do you think a microcontroller would be fast enough?

Would I be correct in guessing that to read the APU commands, I could insert a device between the cart and console (for removability) and check for CPU R/W to be write and Axx to be be a $40xx address. Now that I know that NES carts don't seem to be able to provide their own audio (at least not stra...

The full project is I want to ultimately create a midi output. Muting the audio is just an idea so that the APU output cannot be heard but sound from the cartridge could still be heard if I wanted to use the midi audio live. Just reread the wiki page and saw that the 72 pin connectors do not have th...

Well darn. This is a project I've had interest in for a while. I do, however, have an idea for an alternate design. and that write is additionally copied to the outside world. Could a more permanent solution be to insert a device into the NES that can read the write from outside the CPU for the data...

Would there be anyway to just keep $4015 at 0?

Could I not just check the Axx pins for a $40xx address? I was thinking of just sending zeros on the data signals, but hadn't really looked into it yet. Side question: Would data going from the cart to the CPU be a high or a low on CPU R/W? EDIT: Looked at the APU wiki page. Could I keep $4015 at 0 ...

Long explanation short, I just want to intercept APU commands so that the NES doesn't get them.

I want to create a device that will sit between the the cartridge and the console. While it's purpose is different, I believe the connections it would need would be the same as a Game Genie. My big issue is finding an FPGA board with enough pins for the whole cartridge in and out. So my question is:...

Just looked a little closer. Do I use the Axx pins together to form a binary signal and do the same with the Dx pins? If so, is there a control pin to know when a signal is sent?

Thanks for all the help so far! Am I understanding correctly thst I need to look for the address in one of the Axx pins and the data in one of the Dx pins?

So I need to look at addresses $4000-$4017. Would I want to get those from cart pins or CPU pins and which pins would I want? (Yes I realise I might have to be reciving irrelevant data too.)

I want to get a MIDI output from an NES. I don't mean those MIDI carts, I want to intercept and interpret the sound data from any cart. If anyone knows where to intercept and/or what data to look for, that would be great!