Introduction: The Black Box Under Your Fingertips In 2004, the Nintendo DS (NDS) changed portable gaming. With dual screens, a touch interface, and a clamshell design, it became one of the best-selling handhelds of all time. Under the hood, however, the NDS was a powerful (for its era) dual-processor system: an ARM9 for main game logic and an ARM7 for I/O and sound.
With a proper map, you see:
– Ghidra will find code entry points. Use the Decompiler window. nds decompiler
void powerOn2DEngine(void) // REG_DISPCNT = 0; (0x4000000 is known as DISPCNT) DISPCNT_REG = 0;
Today, thousands of NDS games are abandonware—no longer sold, with source code locked in corporate vaults or lost to hard drive crashes. This is where the quest for an begins. But if you type that phrase into Google, you will be met with confusion, outdated forum posts, and a fundamental misconception. Introduction: The Black Box Under Your Fingertips In
Ghidra requires you to create a custom memory map for the NDS. Without it, the decompiler will produce nonsense like:
Let us walk through a real example. Assume you extracted arm9.bin from a commercial ROM using ndstool . With a proper map, you see: – Ghidra
– For a simple function that sets the display mode, Ghidra might give: