if you want to take the compact mac video signal, and convert it into something that could be displayed by any type of monitor, you need a scalar processor. 

have to buffer the signal, or at least build a pixel clock. Write the data into dual-port RAM. the SE/30 this is real easy to do, you can tap off the clock that drives the 74LS166. SE I have no idea. 

Then the frame data gets retrieved from the second port to scan a secondary display. Once this is designed, you could technically interface an LCD panel, or anything.