Wasn't part of this that RS up through and including RS 2.0 were conventional only? RS2.5 was the first TMCC based RS and that was in the early NYC/SP GP-9?
Also RS 3.0 board does require the early LARGE power Supply board. After RS 3.0, the power board became universal and smaller. Even works with modular Legacy.
I have moved RS 2.0 chips into RS 2.5 platforms and they work in TMCC mode. But the 2.0 Hardware is not command capable. G