SE fastport - t28 adapter

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Hi!

I would like to make a T28-fastport adapter, so I can use a HPR-20 headset (which uses a T28 male connector) with a SE M600 (whichuses fastport female connector.). I don't need data traffic, only to map vcc, gnd, speakers, mic, etc. But I'm not sure what pins to connect to which pins. Also I tried to measure the voltage on the fastport ... but I couldnt find the VPP.