I tested this adapter connected to the Wii Remote with the Mayflash MAGIC-NS adapter and it works like a classic controller so you now have PS1/PS2 controllers can play on Nintendo Switch. It also works great with 8bitDo GBros. The adapter does too, but the buttons are possessed (all triggers, ABXY buttons and select and start buttons) so it doesn't work. I know this adapter only works with the original manufacturer PS1/PS2 Dualshock 1/2 controllers. Here are some controllers I tested. I tested with my PsychoPad III PS1 / Sega Saturn Arcade Stick for arcade games and 2D fighting games but it doesn't work. Also the PS1 Pop'n Music Minicon Controller doesn't work with it. If you want to play Taiko no Tatsujin Drum n' Fun with PS2 Taiko No Tatsujin Tatacon Drum Controller connected to this adapter, I tested it but it doesn't work! Even if you enjoy playing Nintendo Switch with first-party PS2 controllers. Still, I recommend this adapter, but you need a MAGIC-NS adapter, but not for taiko drum players.
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