Hi, I just downloaded the emulator, the ARM code looks very... efficient Anyway, it crashes everytime I try to step into the current game. The call stack is: > gba.dll!ARM7opUNL() Line 417 C gba.dll!ARM7exec() Line 109 C gba.dll!emuStep() Line 188 + 0x5 C dsemu.exe!WinProc(HWND__ * hWnd=0x000f0526, unsigned int msg=273, unsigned int wParam=1104, long lParam=0) Line 335 C and it crashes with a 0xC0000096: Privileged instruction. exception, it seems to come from a bad op.op().