The Legend of Zelda was inspired by Western RPGs says Shigeru Miyamoto, because Nintendo wanted to appeal to more players: "We had to create new types of games"

The Legend of Zelda was inspired by old-school Western RPGs, which weren't popular in Japan at the time. Taking inspiration from these foreign '80s PC games, and wanting to create a non-linear title that could use a save system, Nintendo fellow Shigeru Miyamoto came up with the idea for Link's adventure in Hyrule. In an interview with Famitsu, that's been translated by GamesRadar+, Miyamoto talks about Nintendo's inspiration for both The Legend of Zelda and the Famicom Disc System. An add-on for Japan's version of the NES, the Famicom, the Disc System could play games that required more data via rewritable floppy discs.