ROM Hack How to convert a 32kb(GBARunner2) .sav to 64kb(GBA flashcart) .sav

[Nikokaro]

Hi everyone.
Can anyone tell me how do I convert a 32kb .sav file (used by GBARunner2, GBA emulator for DS consoles) to a 64kb one (used by my gba flashcart)?
Is there a special tool (but I don't think so), or do I have to use, as I suppose, a hexadecimal editor?
In this case can you tell me, precisely and accurately, how to proceed, since I do not have the slightest experience in this regard?

Thanks.

 

[Titney]

Hi everyone.
Can anyone tell me how do I convert a 32kb .sav file (used by GBARunner2, GBA emulator for DS consoles) to a 64kb one (used by my gba flashcart)?
Is there a special tool (but I don't think so), or do I have to use, as I suppose, a hexadecimal editor?
In this case can you tell me, precisely and accurately, how to proceed, since I do not have the slightest experience in this regard?

Thanks.

Unless the emulator compresses the save file or something, it would probably work to simply combine the file with itself to double the size (you could also append a blank file to the save.) One of the simpler ways to do this is using the windows command promt (syntax will be different on a non-windows system but the principle similar)

Something like:
https://www.computerhope.com/issues/ch001376.htm#merge-text
plus
https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/copy

The first link has howto for using the command line, the command you want is something like

copy /b 32kbit.sav + 32kbit.sav 64kbit.sav

 

[Nikokaro]

it would probably work to simply combine the file with itself to double the size (you could also append a blank file to the save.

With a hex-editor I had in fact added 32kb to the file but, strangely, the total size was not 64kb, but a little larger.

One of the simpler way to do this is using the windows command promt

I thought it could be done this way but I didn't know the syntax, and out of laziness I didn't look it up...

....now I will do as you suggest.

Thank you very much