[HP35S] Disassembling ROM

[Tugdual]

I struggle with few technical aspects:
- lack of SPLB31A detailed doc (for example about registers usage)
- how to disassemble segmented ROM
- not sure I really understand how the segmented ROM works. I would imagine that before any jump the code is refreshing the BANK register and then proceeds with normal jump.

Providing that I'm not sure at all about the way the ROM is organized in the 35s.sml file, that is quite a lot of try/fail. I could verify that changing the file has an effect on the simulator, so the ROM is definitely there.