I am very interested. Those actually look surprisingly easy to implement, with the exception of performing clipping in an arbitrary rectangle, the pen settings, and the text functions. I'll probably get started on those after I release my first LuaZM alpha or beta.
Also note that the fillPolygon function on the Nspire supports concave polygons. In order to fill a concave polygon you need to start doing some tricks like triangulation (or similar stuff), so it's a bit more complex. Anyway, it's not that important to support them, but it would be cool
Hmm, that's a good question. Looking at the Prizm RTC Unit documentation, I probably can't use anything from that, but I wouldn't be surprised if I could derive a (rough) 100Hz clock from one of the CPU clocks.
I see AHelper0 found some stuff already, so great !