you appear to be confusing memory and storage. Memory refers to RAM (Random Access Memory). The original gameboy had 8 KB of ram (and maybe 8 KB additional vRAM). Ram is what is used to run a game
storage is where your saves are kept, that was just on the cartridge. Nothing special about it, there is just an instruction in the gameboy that tells the cartridge what to save and where, just like an ssd, usb, sd card, or any other type of storage.
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