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SegaMaster System (SMS) and MegaDrive joystick

pinout

The SMS gamepads are almost exactly the same as normal

9 pin D-SUB female
9 pin D-SUB female connector
PinSignalDescription
1Up  
2Down  
3Left  
4Right  
5Power  
6Button 1  
7N/C  
8Power  
9Button 2  

The Sega Genesis (in Europe sold as Sega MegaDrive) pads are an extension to the Sega Master System pads. They use more buttons (3+1, 5+1, 6+1). They use the one usnused pin as a select pin for reading more buttons.

Source:www.pinouts.ru

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