I am willing to consider that it is not asynchronous but when I have it basically directly connected (level converter / inverter) to my PC and have a program receiving and decoding track times/disc changes etc perfectly, I really think I have it right.

I don't have a scope trace saved but I can easily get one if you're still interested.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)