Ellsworth Beast-Major

This is designed to connect up to 8 SCART devices (consoles, 8-bit micros, etc) to one TV or video monitor.

It auto-detects an incoming signal using solid-state digital muxes, but uses relays to select a channel, so it fully isolates different sources with no crosstalk or signal attenuation.

It can also force 4:3 or 16:9 aspect ratio on compatible SCART TVs, and force the TV to display the RGB signal rather than composite video. There's an LM1881 sync separator IC that is switched in or out of the composite video/CSYNC signal path by a relay.

There's an IR receiver for remote control.

I just need to flesh out the firmware, which I should have time to do over this Christmas break. On the todo list is implementing persistent configuration via remote control or TTL serial interface.

For example, you'll probably want your Nintendo 64 configured to use composite video, while your Super Nintendo or BBC Micro should use RGB. The SCART Invader will remember these settings and switch the TV to the appropriate mode when a signal comes in.