A couple months ago I found a file describing the b_call routine, it was really just a dissassembled version with some comments. Does anyone know if it is still around, and if its not could I just read go through the rst 28h operation in the dissassembler of wabbit emu and read through how everything interacts.

I'm doing this for a reverse engineering project, that's why I want to be able to show and describe in detail how B_call works as it is core the original calculator's function.

Edit: I forgot to mention I have looked at the how memory management works simply explained
http://wikiti.brandonw.net/index.php?title=83Plus:Memory_Mapping
and
http://wikiti.brandonw.net/index.php?title=83Plus:OS:How_BCALLs_work

The short answer to your question is that all you need to do is trace a bcall in your favorite emulator (mine is jsTIfied, for obvious reasons) to see how they work. Just single-step through the instructions, watching the registers as you go, and it should be fairly clear how it works. If you have points of clarification that you'd like to ask, we're more than happy to help! If this is a school project, I also encourage you to show us the finished product, as I'm sure many of us would be interested.

Thank you very much for the assistance.