| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | +6V | +6 VDC (10 mA max) | |
| 2 | GND | Ground | |
| 3 | AUDIO | Audio | |
| 4 | VLOW | Video Low (Unconnected ?) | |
| 5 | VHIGH | Video High |
When I made my own VIC20 monitor cable, I needed to connect pin 4 to the composite video, not pin 5. With pin 5, I got grayscale video rather than color. It was correct when pin 4 was connected.

