I ported Brian Chiaha's code to the Microprofessor + MPF-GRAFX card. Still some glitches, but overall - it works! It was remarkably little work - after all, Z80 machines are not that different. And the code was very well written, with very clear documentation and well-documented TEC-1 firmware calls etc. Thanks, Brian! 

So, here we go: 

And here is my first VLog entry for the RetroChallenge: