I'm working on a port to the RCA RC3000A digital boombox, which is based on Telechips TCC760. A lot of things work already, including playback, USB and FM radio, but more work remains. TCC76x is nice to work on because the chip manual is available and USB boot mode allows easy code uploading with no risk of bricking.
I'm posting here to notify anyone else who's interested in a TCC76X port who may be watching this thread. I hope that's okay despite the age of the thread.