Datel Action Replay (1985)
Over the years, the devices have been able to do this in various ways--from those that have players manually enter codes, to newer versions that simply let you choose from a list of existing codes that can be updated for new titles.
Datel's creation sparked a wave of competitors, including Galoob's Game Genie, which got into a legal battle with Nintendo over its editing of game code. It eventually came out on top, and helped shape the legal precedent for video game copyright law.
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