Also, are there copyright implications to consider? I
know CMD is long gone, but I still worry about these things.
You can get around copyright issues by publishing just the change you made (i.e. change
bytes xxx-yyy to blah). The change is your original work, and you have every right to
publish it. People that need the changes will have the affected ROM, so they can read it
out, apply your change and burn a new one.
That's certainly my last resort. I wish there were a more standardized format for
binary patches (I don't think a universal diff will cover it, except for the case of
hex files).