I have done a lot of studies for LMM for the Prop2 before the last shuttle run. At that time there was no Hubexecute and only quad wide hub-read/write.
This thread is about the new chip we are going to build in the 180nm process.
About code compatibility with Prop1:
I could use some sample code that shows how to run a separate program in a COG. Actually, three programs will run in three separate COGs.