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So, it's the final step to making completely new mods: changing the overworld map. Now, there are still a couple annoying limitations, but it's certainly doable. Behold, a proof of concept: https://www.mediafire.com/?ud5c4brvs9j565b
As always, it assumes you have the standard 512-byte header. Also, as it's just a proof-of-concept, it doesn't do much; it merely makes province 1 adjacent to provinces 6 and 8.
So, what do we have to do for what can be changed so far? Six things!
(1) Obviously, you need to draw (and import) the new map! (2) You need to update the province minichart. Basdically, it shows how provinces are arranged on a grid of 8 columns and 9 rows. Here's how they're lined up in vanilla: https://www.mediafire.com/?s8w8pwg4366i3jc (3) You need to update the 1AE94 distances. Basically, this (72 columns, 41 rows) is the minimum number of provinces a messenger would have to travel. In the vanilla version the province 4 column would, for example, have a 0 in the fourth row (since you're already there), a 1 in the third, fifth, and seventh rows (since those three are adjacent to province 4), and so on. (4) You'll almost certainly need to edit 32B94 battle maps to reflect the different map. I went lazy, in the proof of concept (so the Sea of Bohai exists in battle maps but not the overworld map), but surely you can do better! (5) You'll need to mark 31F16 where troops start on battlemaps. (6) You'll need to edit 19DAE borders for invasions, movement, etc.
Do all six, and you'll have a fully playable mod with a different world map! So far, however, there are two caveats.
(Caveat 1) Although you can change where province numbers are drawn and even what spots blink, I have not found a way to change what tiles are used in the blinking -- which means that instead of them being numbered   etc. they'll be numbered [gibberish][gibberish][gibberish]. So for now, visual province numbers shouldn't be changed. (Caveat 2) Every province is filled in with the same floodfill you've been using in ms paint for years. Although I know where on the map the floodfill spots are, I have not found a way to change what the floodfill spots are. So each province will have to include both its number and its vanilla floodfill spot. For reference, the floodfill spots are here: https://www.mediafire.com/?ddd17p3daigvodf
if I find a workaround for either caveat, I'll let you know. If any of you find a workaround for either caveat, plus let us know! And if you have any questions or anything is unclear, ask away!
EDIT: Whoops, I missed a needed change!
My NES, SNES, and GB all work just fine. Why should I downgrade to a Wii U, PS4, or XBone?