devkitPro

The pinouts are here: http://www.natrium42.com/wiki/File:Dsee-schematic.png Specifically you would be using pins 1,2,3 on IO2 (that is Input/Output Port 2, not 102) 1: GND 2: VDD / VCC 3: TX Pin 2: VDD is in the corner of the board. Pin 1 is on the edge, one row closer to the DS Card edge. Pin 3 is ...

As an alternate to running your arm7 from main ram consider dedicating one or two banks of vram (C & D) to the arm7. This avoids the bus arbitration (AFAIK) and allows you to use an unmodified libnds.

I have to agree with WinterMute that MP3 decoding is a waste on the DS as you won't have time left to do much else. Video decoding is very much a waste too, look at any retail games that use Act Imagine, low framerate (12-15fps) and noticeable compression artifacts. Now on why -mthumb would have mad...