http://datacrystal.org/wiki/The_Legend_of_Zelda:_Link's_Awakening mentions "Z4DXME2", and some other wikis I found mention it as well (or "ZDXAMV_V2"), but I can't find anything on either...
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Any documents on the matter would be useful, as well. Jigglysaint's old one has some data in it, but it's missing things like where the data for how to draw the special objects (like doors/dungeon enterance), as well as a whole mess of other things...