Add support for 64DD

[WinHack9702GitHub]

Hi. I found a way to port LEVEL edits made in Quad64 to the 64DD.

1. Make edits to a normal SM64 (WARNING: USING EXTENDED ROM FOR THIS IS UNTESTED)
2. Hex compare the vanilla sm64 and your edit.
3. In 64dd rom use the replace feature of the hex editor, replace the value in vanilla sm64 to the value from edited rom.
4. save.
5. profit

Can you please add a simple way to edit 64DD SM64?
(UPD: doing the same but vanilla and n64 edit roms are extended and it worked)
WARNING: I don't recommend to try porting tex. I haven't tested that yet, and it may not work or mess up your rom. Thank you!
(UPD 2:Textures are not workin')