This informations has been found with a genuine TRS-80 cable and a multimeter.
| Pin Number |
Pin Name |
Description |
|---|---|---|
| 1 | Motor | Motor sleeve |
| 2 | GND | Audio Ground |
| 3 | Motor | Motor tip |
| 4 | Audio In | Loading from tape |
| 5 | Audio Out | Saving to tape |
| 6 | N/C | Not connected |
| 7 | N/C | Not connected |
The TRS-80 have relay contacts for motor control (2.25mm jack). Audio in and out are 3.5mm mono jack. Pin 6 and 7 are not connected on that original cable. Pin 8 is simply non existant.

