Hi Vincze,
I'm not Giancarlo, but emulators for, if I recall correctly, the 48G, 49G, 48gII, 49g+, and 50g are included with Debug4x. Well, properly speaking, perhaps only one emulator, but with ROMs and .KML files (which define the keyboard and appearance) for all of them.
A limitation for the emulators for the 48gII, 49g+, and 50g is that it's the hardware Saturn processor that's emulated, not the underlying ARM processor, so they can't use the new assembly language instructions, or invoke any ARM processor operations. But as long as you stick to UserRPL, SysRPL, or legacy hardware Saturn code, they should give you a good idea of how the actual calculators work.
See http://www.debug4x.com/.
Regards,
James