Welcome to the boards.
You're probably not looking far enough back. There still isn't a working Xbox emulator and unless you have a very well specced gaming laptop its unlikely you'll get PS2 running on their either.
However just about everything up to and including the PS1 and N64 should run ok on it, and if it has a decent processor and ram you might be able to run Dreamcast and Satrun on it, although in both cases the state of emulation is far from perfect.
There's a dedicated section of the forum for each manufacturer (Sega, Nintendo, Sony etc) so any questions on a related emulator should go in there. Its quite likely that many question you might have will have been asked before so also try using the forum search function beforehand to see if your question has already been answered.
If you have any new questions or questions you can't find an answer to then make a new topic in the relevant forum.
Again welcome and enjoy your stay.