Good idea ..That looks like it might be Electrocoin universal pinout.
Best to remove it and put a JAMMA edge on. As it's all labelled should be easy but time consuming swapping a wire over at a time.
| ELECTROCOIN STANDARD CONNECTOR CHART |
|---|
| Underside |
| Ground |
| Ground |
| +5V |
| +5V |
| +12V |
| -5V |
| Not used |
| -12V |
| Keyway |
| Speaker 1 |
| Speaker 1 |
| Speaker 2 |
| Player 2 Up |
| Speaker 2 |
| Player 2 Right |
| Player 2 Button 1 |
| Player 2 |
| Player 2 Button 2 |
| Player 2 Left |
| (Horizontal Sync) |
| Player 2 Start |
| Video Red |
| Video Green |
| Video Blue |
| Video Sync |
| Ground |
| Ground |
| Ground |