Master System:Connector Pinouts
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Cartridge Port
Controller Port
Note: Female is connector at the console. Male is connector at the controller. Diagram pictured is of the connector at the controller end. This pinout is mostly identical to the SG-1000.
| Pin # | Description |
|---|---|
| 1 | Up |
| 2 | Down |
| 3 | Left |
| 4 | Right |
| 5 | Unused |
| 6 | Button 1 |
| 7 | TH/Light Phaser trigger (Master System) / Ground (Mark III, console side only) |
| 8 | Ground |
| 9 | Button 2 |
Mark III Expansion Port
This expansion port is only found on the Mark III and is mostly identical to the one in the SG-1000 and SG-1000 II.
Note: Pins are numbered from left to right with the edge of the connector facing forward.
| Pin # | Description |
|---|---|
| 1 | Ground |
| 2 | Ground |
| 3 | Ground |
| 4 | Ground |
| 5 | A2 |
| 6 | Unused |
| 7 | IOREQ |
| 8 | CONT |
| 9 | Write |
| 10 | Read |
| 11 | KBSEL |
| 12 | D7 |
| 13 | D6 |
| 14 | D5 |
| 15 | D4 |
| 16 | D3 |
| 17 | D2 |
| 18 | D1 |
| 19 | D0 |
| 20 | A1 |
| 21 | A0 |
| 22 | KILLGA |
| 23 | 5V |
| 24 | 5V |