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Connectors and signals
This section contains information on the following UCC MMI-2 ports:
| Key | Description | Key | Description |
| 1 | Scale 0 interface (15W HDD socket) | 5 | PICS (9W D socket) |
| 2 | Scale 1 interface (15W HDD socket) | 6 | PC connection (USB type B) |
| 3 | Scale 2 interface (15W HDD socket) | 7 | Earth terminal |
| 4 | Machine I/O (44W HDD socket) | 8 | UCC MMI-2 power jack (6.3 mm socket) |