They exist but the sites are mostly in Japanese so you wont find them with english google searches. There were a whole pile of them for retro right upto newer consoles but datel wasn't the only maker as they were made by other companies too, Japan loves to hack & cheat as much as anywhere else. They were pretty popular over there, hell even nowdays you can find data auction on YAJ where they have unlocked everything in a game & are selling the data lol
The Japanese wikipedia page on them has a pretty complete list of consoles that got AR in Japan
http://ja.wikipedia.org/wiki/%E3%83%...83%AC%E3%82%A4
Interestingly the famicom did have one too but it looks like it was released well after the era of the famicom had ended as it comes with a weird famiclone called the famulator, looks pretty funky like they shrunk a famicom
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