[dougmwne]

Clearly the solution is to have two displays refreshing on a 30 second alternating cycle! Maybe add a third black and white high frequency screen displaying an arrow pointing to the currently active screen. I jest:)

It actually really makes me want to build a Solari board for my local metro station.

[c22]

No need for a third display, just put the alternating primary displays on opposite sides of a giant flipdot.