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

GBAATMP

DavidGba

Member

Newcomer

Level 1

Feb 5, 2023

Rom (with trainer) crashes / behaves weirdly, why?

- Using GBAATM-Rebirth (cannot post link because I am a newbie on this forum and must contribute to x amount of threads first ...seems to give the wrong motivation, too bad...)
- Applying following codes (below)

Result after 8 Seconds into a level...

Video
(cannot post link because I am a newbie on this forum and must contribute to x amount of threads first ...seems to give the wrong motivation, too bad...)
(cannot embed, seems to not work with h265)
-> I did try to add it as attachment (.mp4)

Codes

CSS:

m
0000D0D3 000A
10000954 0007

Unlimited Time
83000BF0 0509

Unlimited Hearts
33001910 0008

Max Heart Gauge
33001914 0008

Have Gem Piece
33000C07 0001
33000C08 0001
33000C09 0001
33000C0A 0001

Have Compact Disc
33000C0B 0001

Max Coins
83000BF8 0909
83000BFA 0909

L+R+Right = Max Medals
D0000020 0310
83000008 03E7

Select+L+R = BossHP is 1
D0000020 0304
33000A41 0001
D0000020 0304
33000A41 0002

L+R+Down = Have Key
D0000020 0380
33000C0C 0001
D0000020 0380
33000B80 0001
D0000020 0380
33000B82 004B

R+L+Up = Open Level Exit
D0000020 0340
33000C0D 0001

Sel+R+Up = Normal Wario
D0000020 0144
33001898 0000

Sel+R+Down = Swimming Wario
D0000020 0184
33001898 0001

Sel+R+Right = Burning Wario
D0000020 0114
33001898 0002

Sel+R+Left = Fat Wario
D0000020 0124
33001898 0003

Sel+L+Up = Frozen Wario
D0000020 0244
33001898 0004

Sel+L+Down = Zombie Wario
D0000020 0284
33001898 0005

Sel+L+Right = Snowball Wario
D0000020 0214
33001898 0006

Sel+L+Left = Spinning Wario
D0000020 0224
33001898 0007

Sel+Up = Floating Wario
D0000020 0044
33001898 0008

Sel+Down = Bat Wario
D0000020 0044
33001898 0008

Sel+Right = Flat Wario
D0000020 0014
33001898 000A

GBAATM screenshot

GBAATMP

Member

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