I just tried out the build from post #36, and I haven't encountered any issues yet. Many thanks to zfeet and co. for getting back to work on this - I've been waiting since last summer, and didn't have high hopes, until I checked the forums yesterday. I would have taken a crack at it myself, but I'm not up on ARM ASM; I don't have any ARM hardware to play around with on my own time, and my university teaches HC12 in the lower-level courses instead of something useful :/ Anyhow, I'll let you know if I encounter any bugs. Keep up the good work!