nesdev.org

maybe post some pictures, if you can.

If you take it apart, you should see 2A03 on the CPU and 2C02 on the PPU.
FamiClones may have different numbers or blank chips.

I recorded my Famicom and here is how it is suppost to sound,

http://www.54.org/condev/akumajo.mp3

You need to modify your NES and NES/Famicom converter.

Look here:
http://www.54.org/condev/NESMods/NESMod ... Pin_18.jpg

Take your NES/Famicom converter apart and solder a wire from pin 46 on the Famicom side to Pin 18 on the NES side.

I think CMOS and TTL both act differently when left floating. By default, I think TTL is always high, when left floating. CMOS on the other hand is different, and can act strange if left floating. You always want to pull up or pull down a CMOS device. But you usually don't want to float anything, be...

The only game I know of that acutally used the microphone was The Legend of Zelda for Famicom Disk System.
You remember the Polvoice?
You could yell into the microphone and they would all die, probably because they had big ears.

True,
I've cut off pin 4 in a few NES's and it always worked.

Someone mentioned it is suppost to be soldered to GND, not sure why...

Perhaps its pulled to ground, by being left floating?

I made a little list of the mappers: TOTAL MAPPERS: ----------------------- 483 Nintendo MMC1 438 Nintendo MMC3 178 UNROM 155 No Mapper 130 CNROM 39 Color Dreams 38 AOROM 35 Unknown 30 Namcot 106 26 Bandai 21 Nintendo MMC5 17 74161/32 15 Jaleco SS8806 14 GNROM 13 Nina-3 (AVE) 11 Taito TC0190 11 Came...

The easiest mod, involves removing the metal bar, so you can put carts with EPROMs in, else they won't fit. http://www.54.org/condev/NESMods/NESMods_Remove_Metal_Piece.jpg Next, to disable the chip that give you that annoying flashing screen, http://www.54.org/condev/NESMods/NESMods_Disable_Lockout_...

Good Job. The FDS hardware actually clears the NES. I found that if you use 2 Game genies and a NES-JOINT cartridge, you can also clear the front-loading models (but that's overkill :) ). I tried this but got sprite corruption. But I bet if you put 8 470ohm resistors in series with the data lines o...

I've never seen a Famicom cart do anything with the Famicom audio.
It would probably cost too much to do anything with the Famicom audio, besides using a cap to roll off the highs.
Most carts I've seen just mix it using 2 resistors.

Pictures of my homemade Famicom/NES converter.

http://www.54.org/condev/FC_NES_Conv/

Materials used:

NES Cart (with all edge connecters)
EDAC Cardedge Connectors 60P SOLDER TAIL 5.08mm ROW SPACE (mouser # 587-395-060
IDE Cable (or floppy cable)
8 470 ohm resistors

I'm very impressed with Kevin's accomplishment. I've seen 6502 CPU data for FPGAs, but I guess he made the PPU data, from reverse engineering it. I see that he's getting closet to having all the major mappers. FDS support would be a bit harder, as you'd have to emulate the drive and hardware. Still ...

I solved this problem a different way. Inside the NES there is junction point where audio from the input of the 2A03 is mixed with the input of the bottom connect, its easy to spot because there are 3 22K resistors lined up. I used an unused pin (typically) of the NES edge connector (pin 18), passed...