Hmm.
You can use the following options:
-Composite Video with an A520 video modulator or a Video Converter board in the A2000 video slot (such as the Electronic Designs video converter board, that gives broadcast quality Composite, S-Video and RGB out).
-S-Video with the above mentioned board
-RGB via either a 23-15 pin VGA adapter (the Commodore tin box shipped with A4000's) (might work) or via a Scandoubler/Flickerfixer (either external, or perhaps the C= A2320 Amber flickerfixer board or similar) (guaranteed to work).
Other opions might also be available, but the Above mentioned ones should definately be there.
-Paul