Hi all,
I made a screencast of myself using the Cog VM simulator to solve a bug in the Sista VM (including single stepping in machine code generated by the JIT) and published it on youtube:
https://clementbera.wordpress.com/2018/03/07/sista-vm-screencast/
https://www.youtube.com/watch?v=hctMBGAXVSs
It's not amazing, you have to deal with my French accent, but some of you might be interested.
Best,