did you forget Syx already?
After many months of inactivity (that will continue unfortunately) due to my lack of time, i created two images that briefly explains how the initialization and the scheduler of Smalltalk YX work.
The initialization is explained here: http://code.google.com/p/syx/wiki/InitArch
The scheduler here: http://code.google.com/p/syx/wiki/SchedulerArch
I hope to obtain more time to spend on Syx, i won't leave the project anyway.