Here is my old Transfer Pak library for the n64, which can handle the bg camera mapper since a few months, too. the features are reading rom and rw ram on the most common mappers. ^^ (it's based on libdragons mempak functions) https://github.com/saturnu/libgbpak If someone wants to play around with the gb camera and the n64, there is a great RE project by AntonioND. https://github.com/AntonioND/gbcam-rev-engineer it's possible to write to a register addr, here is an example: //keep in mind, that the transfer pak can only write/read 32 byte blocks memset(sdata, 0x8, 32); value = write_mempak_address( 0, 0xFF80, sdata );