nesdev.org

I'm a moron. shift_count never gets read as 0 because it is inced after it gets set to 0. Thanks for making me check my work tepples. I got compare mode to work though. It's not very well documented on arduinos. You have to read the atmega*8 datasheet and guess what the arduino will call the variabl...

http://upload.wikimedia.org/wikipedia/en/thumb/5/5e/Skate91-300.jpg/120px-Skate91-300.jpg http://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Logic-gate-or-us.png/120px-Logic-gate-or-us.png http://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Dice.jpg/180px-Dice.jpg You could try extractin...

I got "Welcome green(?)" to play now. It's extremely static filled and muddy but I chalk it up to paring 2.2k and 1k resistors instead of 2k.

Thanks guys.

Maybe it's 4-bit PCM, or other bit resolution. I guess ADPCM could be possible, but I doubt it's that. In an emu you can put a breakpoint on writes to $4011, then see what it did before writing. Good call! It looks like that's exactly what it does. LDA ($D1),Y @ $9253 = #$98 BEQ $F494 INY STY $00D0...

Well, it turns out it's PCM. I should have ruled that out before I posted. :oops: When I use audacity and import it as 8bit unsigned, little endian it doesn't sound quite right. I know the NES uses 7-bit but isn't it stored as 7-bits packed in a byte? Also, what's a good way to find the start, end a...

My idea isn't fully fleshed out yet, but I want to rip DPCM sound from games and play them back on a microcontroller. I did some fooling around with the 18.exe tool from pineight.com and got some sounds. I was able to pull out the the drum sample and some slashing sound from Ninja Gaiden but I had p...

Thanks.
I wish it had been a MBC problem. Then I would have been more justified in bothering you guys.
It still needs some work. Pokemon Blue is my only game with multiple RAM banks and I can't switch them out.

I got it to work! I was trying to be crafty and have my shift register's clock and WR on the same GPIO. I split them up and it started working.

Thanks for input everyone. It helped narrow down where to look for problems.

Oooh pretty document! More coherent that what I've been reading. The clock speed of the arduino board is 16MHz but I don't have a way to count cycles as it's in pseudo-C. I scattered in some 1 micro second delays and put two 10 microsecond delays in the write loop. I know that's probably orders of m...

Well I'm sorry I brought your post back from the dead then. I'll go remove it.

I bet if I could bankswitch ROM I'd be a lot closer to reading RAM. Any thoughts?

Nothing to see here. Now move along.

I found a Donkey Kong Land III cart to play with. My cart reader detects it as this: DONKEYKONGLAND Cart Type: 3 : ROM+MBC1+RAM+BATT ROM Size: 4 : 512KByte RAM Size: 2 : 8KByte I have played and saved multiple games to it. So the RAM isn't blank. I've written 0x01 to 0x6000; 0x00 to 0x4000 and 0x0A ...

Well I never get new data much less multiple.
I never said I got MBC3/5 working. I just detailed how MBC1 wasn't working.

EDIT: The wiring looks fine.

What else could be wrong? Timing?

For the purposes of GB bankswitching, nothing is internal to the gameboy. They are all addresses in the cartridge ROM area of the memory map. (0000-7FFF) Ok, that's good to know. One document showed a gameboy memory map and I got frightened. MottZilla are you referring to this? The MBC1 defaults to...

I've got a gameboy cartridge connector attached to an arduino and I'm having some problems. I can get the game's name from 0x0134 and read up to 0x4000, but I can't switch banks or read RAM. I think my problem is that I'm not understanding the documents about the MBCs. They are all from the point of...