Preservation project. I'm upgrading old NES and SNES cartridges with better eprom batteries and battery holders. You'll lose your save games with the mod, but get years more use from old games.
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How to Replace an SNES Cartridge's Save Game Battery
Will an NES or SNES game that wasn't used much continue to save reliably today? Or does it not matter since the batteries are so old now? I don't want to be
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Aidan Moher on Twitter: "SNES games use battery-backed SRAM to hold save files. Basically, this means a battery trickles a tiny but consistent stream of electricity to the SRAM to keep it "
Replacing an EarthBound Battery « EarthBound Central
Your SNES Games Might Be Dying. This Is How You Can Save Them
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How to Replace an SNES Cartridge's Save Game Battery
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