MrCART FAQ

How do I know which game is stored in flash?
The first line shows LOADED-> Game name.vb.
What is the maximum microSD card size?
32 GB.
Where are save games stored?
In the SAVE folder. The save file is written during the next power cycle after saving.
Why are there save files in the SAVE folder for games that don’t support saving?
MrCART does not know which games support saving, so it treats all games as if they do.
Does MrCART use an internal battery?
No.

Known issues

ROMs smaller than 256 KB:
You likely have one of the first MrCART units without the updated firmware. RetroOnyx units can flash all power-of-two sizes.
32 Mbit games launched with FLASHED->:
Original MrCART units and RetroOnyx batch 1 and 2 units may crash if you start the game using FLASHED->. A fresh flash works correctly. Your cartridge needs a firmware update to fix this.
3D Tetris save game:
Original MrCART units and RetroOnyx batch 1 and 2 units are affected. The game cannot save. This is a hardware issue.