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VTL On the Hackaday Forums was able to use a 2kb Msp430 to trick a Audi Concert Stereo into thinking it has a CD-Changer connected, enabling Aux Inputs. The code is a Port of a Arduino Port of a AVR Port of the VWCDPIC project (PIC Based). Using a MSP430G2231, VTL was able to implement two different Uni-Direction Protocols, through Timer_A1 and the Watchdog Timer using extra software delays. The same protocol is used in B5, B6 and B7 Audi A4s i.e. Generation I, Generation II and Generation II+ Audi head units. Unfortunately, the code is no longer available, but the post is still a nice writeup on reverse engineering a stereo and porting of code found on the internet, with good pictures too. http://forums.hackaday.com/viewtopic.php?f=3&t=123