The Mega Drive / Genesis controller also has extra buttons on the top, as you can see in the tweet below. There's also a 'Mode' button, which is curious, as this was only included on the 6-button ...

BitDo's modernized Nintendo 64 controller was designed for Analogue 3D, but you can use it to play classic N64 games on ...

Most of the buttons have a clear one-on-one mapping, but since the “minus”, “capture” and “home” buttons are missing on the N64 controller, he chose to map these to button combinations ...