Read N64 cartridge
Apply the following switch settings:
(Reading/writing Eeprom might not work with repros)
Furthermore the n64.txt database file needs to be in the root of the SD card.
Insert the N64 cartridge into the N64 slot and power on the cart reader.
Since N64 ROMS are quite big there is an option to dump the ROM and calculate the CRC32 at the same time called "fastcrc". Without it would dump the ROM first and then calculate the CRC32.
Doing both simultaneously is faster but it does not work with all Cart Reader/Mega Pro 2560/SD card combinations.
If you have issues dumping N64 ROMs you can disable fastcrc by adding // in front of "#define fastcrc" found under HW CONFIGS in Cart_Reader.ino.