Ah the 128[D]...still my favorite computer of all time.
Watching youtube videos today, people are using 2 monitors to display the 40 and 80 column screens at the same time ... I don't know why I never thought of that!
Also, to me what would be more interesting would be a device that somehow would take the digital output of the two video chips and merge them in a way that would expand the color range... Sort of how those 80 column interlaced modes simulated 512 colors...
My 128D[CR] is sitting in the basement. It powers up but I don't get video ... or at least the "Basic" screen does not display in any mode...