If you use a C64, you need an Easy Flash 3 cartridge.

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Here is a video I made about them.
httpvh://www.youtube.com/watch?v=TK3iW0Ietow

EasyFlash 3 offers a number of features:

• 8 8kB slots for alternative KERNAL ROM images,
• 7 EasyFlash I cartridge image slots.
• Support for the following cartridge formats
  • Normal 8k
  • Normal 16k
  • Ultimax
  • Ocean Type 1
  • EasyFlash
  • EasyFlash xbank
• Compatibility with Action Replay, Retro Replay, Nordic Power, and Super Snapshot 5 images.