The SMS gamepads are almost exactly the same as normal
| Pin | Signal | Description |
| 1 | Up | |
| 2 | Down | |
| 3 | Left | |
| 4 | Right | |
| 5 | Power | |
| 6 | Button 1 | |
| 7 | N/C | |
| 8 | GND | |
| 9 | Button 2 |
Each button (left, right, button 1 ect.) is in fact a voltage(very small), this voltage is grounded to result in movement, fire, jump ect. For standard master system controllers this is directly feed to the system via wires only (some other controllers use a micro chip) they also are not connected to voltage, while some others do.
правильный
с ошибками