eli5: How did old NES cartridge games save your game?

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I mean the ones like The Legend of Zelda that saved your game without the use of passwords. How was your game saved on the cartridge? Did it work the same way as an old floppy disk?

In: Technology

7 Answers

Anonymous 0 Comments

It saved on a small memory chip inside the cartridge. They had a small battery (much like, probably even identical to, the ones you find on computer motherboards).

After a long enough period of time those batteries do die and you do lose saved progress and the ability to save until you replace the battery (particularly anything you save is lost as soon as you remove power).

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