There isn't any easily convertible signal which would give you a composite video output. The display is driven directly by the CPU.

pca has designed a video output board for the empeg but it costs a huge amount to produce and it was under contract to a third party so the design isn't available. I believe he accomplished it by adding an extra board inside the player which connected via the IDE port to transfer the display data. He did design the hardware of the empeg so he has a advantage over the rest of us.

It has been done so it's possible at least. It's not a single chip solution so expect some hard work

- Trevor