NES-QJ

Cartridge Board

Tech Specs:

A chip on board cart 256K of PRG ROM
256K of CHR ROM
MMC3
74HC161

The Tech:

This board uses an MMC3 (hidden under the second blob on the left, a 74161 (blob on the right, which also houses the lockout chip), and 256K PRG/CHR ROMs (Blob on the left, and 2nd in on the right, respectively). It works just like any other MMC3 cart, except D0 of 6000-7FFF controls which 128K bank both the CHR and PRG roms use. The MMC3's WRAM output was used for this function. This board is only found in the World Cup Soccer / Super Spike V' Ball cart.

See the MMC3 documentation page for information on how the mapper works.