Make sure that uSD contains the following folders: _SYSTEM_, SAVE, GAMES.
System folder used by the cartridge menu and file list.
Save files are stored here. Files can also appear for games without save support; those files are not relevant.
Your Virtual Boy ROM library goes here, with folder and subfolder support.
Copy your .vb files in GAMES folder (max two folder levels).
If it is the LOADED game, the game starts directly. Any other game will show:
| ROM size | MrCART | MrCART 128 |
|---|---|---|
| 128 Mbit ROM | - | 90s |
| 32 Mbit ROM | 54s | 18s |
| 16 Mbit ROM | 36s | 12s |
There are two parts of MrCART 128 that can be updated:
Copy firmware_XX.bin to the uSD root.
Rename the file to firmware.bin.
Connect MrCART 128 to the Virtual Boy and power on.
The firmware updates and then the menu starts.
UPDATED.BIN.To update the menu, replace _SYSTEM_/menu.bin with the new menu.bin, keeping the same file name.