What other MVS schematics exist? From what I remember there is no AES schematic, correct?
I'm not an authority but I believe the only schematics in circulation are MV-4, all copied from the same source. To me though that's OK since it's pretty much the ideal board being the most complete/discrete. Even much of the later revisions can be derived from it.
There's at least one AES schematic, well, sort of, my WIP. I've traced a bit of the core circuit but grown very bored with the many nameless ASIC signals. I don't have the time or hardware to analyze anything so the cryptic official names are especially important to me as they give a little insight as to what they do. Does that constitute trade secrets? Personally I don't think so since they don't reveal any logical functions but if you have the schematics and you do, I can give things more generic (in many cases better) names.