1) An Official Nintendo Game Boy Micro Game Link Cable.
2) Any Gameboy Advance to Gamecube Link Cable. The directions below show how to use the following link cables:
- Official Nintendo Gamecube to Game Boy Advance Connector Cable
- Nyko CubeLink cable
- MadCatz SystemLink cable (For both GCN & GBA connectivity via the GBM)
3) Soldering skills
for the nyko cable go to step 3
Step 1: Official Nintendo Gamecube to Game Boy Advance Connector Cable Directions
Please note that I've only stripped the wires a tiny bit. You'll see why in the next step.
Step 2: Next
After you've finished this, you can try to stuff it back into the GC connector housing. If you do, be sure to cover your work with electrical tape and provide some strain relief on the cable. I end up using a small project box to enclose the electronics.
Step 3: Nyko CubeLink Directions
I don't have any fancy pictures for this method but it should be self-explanatory. The completed cable is shown above.
First, cut the GBA end from the Nyko cable and cut one of the two Micro cables at the central "hub". Strip the wires so you can wrap them and make a nice solid connection. The wires link like this:
Nyko Cable -> Micro Cable
Black -> Wire shielding
Orange -> Green
Brown -> Brown
Green -> Orange
Blue -> Red
White -> Blue
Wrap everything up with electrical tape making sure that none of the wires touch another, or use heat-shrink tubing. I wrapped each individual wire with electrical tape and then carefully placed all of them in the shielding that I grabbed from the Nyko cable. I used small zip ties on the cables to decrease the stress on the solder joints in case the cable is pulled. Everything is contained in the shield on the right.