Hi, I have a GBxCart RW + FlashGBX, and I'm trying to write an emulator .sav to a batteryless SRAM repro cart (FlashGBX identifies it as: Save Type: Unlicensed 512K SRAM 64KiB, Cartridge Type: 2006_TSOP_64BALL_6106 with W29GL128SH9B). My emulator save is 131088 bytes ("Pokemon - Emerald Version.zip"; 128KB + 16 byte header I think). Every attempt to write it via FlashGBX ends in either "save file was erased due to corruption" or it reverts to a previous save. I also tried patching a fresh Emerald ROM with the gbarompatcher website (SRAM Batteryless patch) and writing that instead, same result. I dumped the SRAM after making a test save on the cart and ran it through Python to check the sector structure, the magic bytes don't match standard Emerald format (expected 0x08012025, getting values like 0x01006f4f). PKHeX also rejects the dumped .sav with "unsupported file type/size" even though it's 65536 bytes. ("FreshPatched.zip" is a rom and save dump from after I wrote the patched rom to the cart, and "TestSave.zip" is a save on said patched rom up to the point of acquiring a starter, and then saved at Route 101. I progressed to the same point for "OG.zip") Writing to the OG, Patched, and Test-Saved roms through FlashGBX and injections all ended in errors, regardless of how many times I tried to read the bytes and find the save point. At some point in the process, it started saying that the SRAM size was 64KiB even though I could have sworn it was saying 128KiB for a while but then it changed and I don't know how or why that might be. Maybe I'm just going insane. I've been doing trial-and-error for two days now. Questions: What save format does a batteryless SRAM cart like this actually use, and is it compatible with a standard emulator .sav at all? How can I write my save properly to a cart like this? Is there a tool to convert/inject an emulator save into the format this cart expects? Thanks in advance.

PocketNES update, assisted by AI

Krem Quay · 2026-05-13T13:11:26+00:00

Thanks to AI like Gemini and Claude Opus, a person like me who doesn't know anything about coding can add more mappers to PocketNES. Take a look: https://github.com/GamingFanboy365/pocketnes

[Advance Wars 2] Modify CO Cheat Codes

Zeda

New Member

Newbie

Level 1

Sep 29, 2024

Hi folks, not sure if this is the right place to put this, and hopefully I titled and tagged this correctly.

I've been wanting to do a play-through of Advance Wars 2: Black Hole Rising, but where I complete the Campaign using the same CO for all battles. This requires cheat codes, but I couldn't find any for this purpose. After inspecting RAM, I found the byte and put together the following:

Modify CO:
Player 1: 320232DD 00xx
Player 2: 32023319 00xx
Player 3: 32023355 00xx
Player 4: 32023391 00xx

Where xx is:
00 - Nell
01 - Andy
02 - Max
03 - Olaf
04 - Maxie
05 - Grit
06 - Kanbei
07 - Sonja
08 - Eagle
09 - Drake
0A - Sturm
0B - Flak
0C - Lash
0D - Adder
0E - Hawke
0F - Hachi
10 - Colin
11 - Jess
12 - Sensei

While I was there, I found a few other bytes that may be interesting:

Instead of the $50k cheat, the following gives you about $983k which could be useful for Colin:
- Big Money ($993k): 820232C2 000F
- It's a 32-bit unsigned integer, and that is loading the upper 16 bits. If you use FFFF instead of 000F, then you'll get an obscene amount of money.
Units have 12 byes of memory each. Indexing at 0, where "Byte 1" is the second byte:
- Byte 1: 0 if the unit can be moved, 1 if it has already been moved
  - e.x. Unit 1 stays unmoved: 32022691 0000
- Byte 7: First unit being carried (e.x. used for an APC carrying Infantry)
  - This is an index into the Units array (1-indexed), so a value of 01 means it is carrying the first unit in your list. Units can carry themselves.
  - e.x.: Unit 1 Carries Itself: 32022697 0001
  - I haven't tested if you can carry another player's units o.o
- Byte 8: The second unit being carried, same as above, and you can carry the same unit, twice.

GBA [Advance Wars 2] Modify CO Cheat Codes

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