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kbeckmann / game-and-watch-retro-go

Emulator collection for Nintendo® Game & Watch™
GNU General Public License v2.0
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Extract save file / compatibility of state save with other emulators #195

Closed cryptoluks closed 2 years ago

cryptoluks commented 2 years ago

Thanks for the great work, it works flawlessly for my GBC roms.

I wonder if there any feasible (hacky) possibility, to use the state saves or part of it in any other emulator at a later point. Would it be possible to parse the state saves to build a generic sav file?

When doing an in-game (SRAM save?), is this data actually preserved in the GW retro go state save backup and therefore possible extractable if knowing the position/structure?

Thanks for any hint or suggestion.

kbeckmann commented 2 years ago

You can see the details of the save file here: https://github.com/kbeckmann/retro-go-stm32/blob/main/gnuboy-go/components/gnuboy/loader.c#L831

You could ask in the discord if someone has already written a converter as I know other people have asked for the same thing.

On Tue, 20 Sep 2022 at 08:53, cryptoluks @.***> wrote:

Thanks for the great work, it works flawlessly for my GBC roms.

I wonder if there any feasible (hacky) possibility, to use the state saves or part of it in any other emulator at a later point. Would it be possible to parse the state saves to build a generic sav file?

When doing an in-game (SRAM save?), is this data actually preserved in the GW retro go state save backup and therefore possible extractable if knowing the position/structure?

Thanks for any hint or suggestion.

— Reply to this email directly, view it on GitHub https://github.com/kbeckmann/game-and-watch-retro-go/issues/195, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAX5HECZFLNMWGX4NNITPMTV7FNPVANCNFSM6AAAAAAQQYAXVA . You are receiving this because you are subscribed to this thread.Message ID: @.***>

cryptoluks commented 2 years ago

The battery save seems to be simply appended starting at offset 0xD000, as also indicated by the gnuboy saved state file header.

So extraction with, for example, dd: dd if=./saved-state.save of=./battery-save.sav bs=1 skip=53248

Import to a saved state should also be possible, by using seek=53248 on the saved state output file.

kbeckmann commented 2 years ago

You can see the details of the save file here: https://github.com/kbeckmann/retro-go-stm32/blob/main/gnuboy-go/components/gnuboy/loader.c#L831

You could ask in the discord if someone has already written a converter as I know other people have asked for the same thing.