Gamestop (Universal system selector) A/V switch for DVD, Xbox, Playstation and Dreamcast video, N64 w/support for composite and Svideo available. Part # BB-172
This item is no longer available through Gamestop. The item has 4 video inputs as described with two channel audio, a composite video connection and an Svideo connection. These inputs are switchable and are labelled N64, Other, Xbox, and Dreamcast. Although I am sure you can hook up other game systems through this.
There is a single output with two channel (stereo) audio, composite video and Svideo connections.
Cables are not included!