A genlock for the CDTV
This Genlock module was produced by Commodore, but wasn't widely available, and may have only
been available to developers and VAR's. You can switch between CDTV-only, genlocked, and
external-only video modes by pressing the Genlock button on the infra-red remote control.
The CDTV Genlock module includes the following ports:
Composite video out
S-Video (SVHS) out
Composite video in (note that it lacks the RF-Modulator output of the standard
module)