genlock
- composite input and output (2× BNC)
- controlled by software through the parallel port
- Background mode - colour zero is transparent, all others float above the live video backdrop
- Foreground I mode - permits colours other than colour 0 to become transparent
- Foreground II mode - restores opaqueness to the colours used in Foreground I mode
- Video mode - shows external video alone
- Amiga mode - displays graphics only
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