UPDATE: This post is somewhat deprecated and you should check the thread over at DSDev for the latest conclusions.
TauZero has molested his Metroid cart to bring you the potential pin mappings:
Starting from the left, pins facing you:
Pin 1 -> GND
Pin 2 -> pin 5 of ROM and pin 6 of the EE (EE CLK)
Pin 3 -> pin 17 of ROM
Pin 4 -> pin 44 of ROM
Pin 5 -> pin 42 of ROM
Pin 6 -> pin 1 of EE (EE CS)
Pin 7 -> GND
Pin 8 -> VCC
Pin 9 -> pin 18 of ROM
Pin 10 -> pin 19 of ROM
Pin 11 -> pin 20 of ROM
Pin 12 -> pin 21 of ROM
Pin 13 -> pin 24 of ROM
Pin 14 -> pin 25 of ROM
Pin 15 -> pin 26 of ROM and pin 2 of EE (EE DOUT)
Pin 16 -> pin 27 of ROM and pin 5 of EE (EE DIN)
Pin 17 -> GND
For more of his thoughts on what this means continue reading the DS Cart Pinout thread over at gbadev's DSDev forum.
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