https://github.com/sanni/cartreader

A shield for the Arduino Mega that can back up video game cartridges.

DIY Open Source Cartridge Reader

This project represents a community-driven effort to provide an easy to build and easy to modify cartridge dumper.
Happy making. 🔧🔨😊

For any questions or issues please also visit the accompanying thread in the Arduino Forum.
And be sure to check the guides in the Wiki too.

Features:

• Completely stand-alone, does not need a PC to operate (unless for updating firmware)
• Easy to modify open-source code, write your own extensions and share them with others
• Portable thanks to a battery
• Modular design using mostly off-the-shelf components

Supported Systems:

• Reads NES, Famicom and Family Basic cartridges including save
• Supports Mapper 30/NESmaker and flashes INL NM30 boards
• Reads SNES roms and reads/writes save games from and to the SNES cartridge
  Supported cartridge types so far: LoRom, HiRom, ExHiRom, DSP, SuperFX, SuperFX2, SDD1, CX4, SPC7110, SA1 (last two chips need Adafruit Clock Generator)
• Reads and writes SNES Satellaview 8M Memory packs (BS-X cartridge and Adafruit Clock Generator needed)
• Reads and writes Nintendo Power Super Famicom Memory Flash Cartridges (needs Adafruit Clock Generator for best result)
• Reflashes some Chinese or custom-made SNES repros with AM29F032, MBM29F033, MX29LV320 or MX29LV640 flashroms
• Reads N64 roms and reads/writes save games(4K/16K Eeprom + Sram + all 3 types of Flashram), Eeprom needs Adafruit Clockgen by default, Proto carts are not supported yet
• Reads and writes N64 controller paks and also can test a N64 controller's buttons and thumbstick
• Reflashes some Chinese N64 repros with S29GL type flashroms
• Reflashes N64 Gamesharks with SST 29LE010(and similar) eeproms
• Reads Game Boy (Color) roms and reads/writes save games
• Reads and writes Nintendo Power Game Boy Memory Flash Cartridges
• Programs custom-made Game Boy (Color) flashcarts with AM29F016, AM29F032, MBM29F033 flashrom
• Programs EMS GB Smart 32M flash carts
• Programs Gameboy Camera Flashcart
• Reads Game Boy Advance roms and reads/writes most of the save games(4K Eeprom, 64K Eeprom, Sram/Fram, SST39VF512 512K flash + MX29L010 1M flash)
• Reflashes some Chinese GBA repros with i4000L0YBQ0, i4400L0ZDQ0, MX29GL128E, MSP55LV128, PC28F256M29 or M29W128GH flashroms
• Reads Sega Mega Drive roms and reads/writes save games(Sram/Fram, Eeprom)
• Reads Sega Master System roms and saves (using Retrode or Raphnet adapter)
• Reads Sega Game Gear roms and saves (using Retrode adapter)
• Reads some Sega Mark III cartridges (using Raphnet adapter)
• Reads some Sega SG-1000 cartridges (using Raphnet adapter)
• Reads some Sega Cards (using Card Catcher and Raphnet Mark III Adapter)
• Reads PC engine/TG16 cartridges (using Retrode TG16 adapter)
• Reads WonderSwan cartridges (using custom adapter)
• Reads NeoGeo Pocket cartridges (using custom adapter)
• Programs flashrom chips like AM29F016B/D, AM29F032B, MBM29F033C, MX29F1601, MX29F1610, MX29L3211, MX29LV160, MX29LV320, S29GL032M, MX26L6420, MBM29F800BA, AM29F800BB, LH28F016SUT, AM29F400AB, E28FXXXJ3A and AM29LV033C (using custom adapter)
• Programs M27C322 eproms (using custom adapter)