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Retro Steam Deck mod launches games using floppy disks
(www.club386.com)
Vintage gaming community.
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So basically what Nintendo, Microsoft and Sony does with the code in a box cartridges and discs. I think it defeats the purpose, if the game is not on the disk. This would make more sense with microSD cards, where the games are actually on the card. As soon as you insert the card into the Deck, it will appear in Steam as a game.