Nestopia Save State
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What is an NS1 file?
Save state created and used by Nestopia, a Nintendo Entertainment System (NES) emulator; stores a saved game state that allows you to resume your game from the save point point at a later time.
Nestopia provides 9 quick save slots that use the ".ns1" to ".ns9" extensions for saving states of a game. The save state will have the same name as the .NES ROM file it is created from. If the NES file is named game.nes then the NS1 file is named game.ns1.