Sega Megadrive & Mastersystem Controller Interface Pin Out

Sega DE-9 (SMS & Mega Drive)

• Pin 1: Up
• Pin 2: Down
• Pin 3: Left
• Pin 4: Right
• Pin 5: +5V
• Pin 6: Button 1 (Trigger A)
• Pin 7: Select (MD Only) / TH Line
• Pin 8: GND
• Pin 9: Button 2 (Trigger B)