Here you will find several guides to some of the systems to help you use them better.
Here are the systems available:
32X
Amiga
Atari Jaguar
Atari ST
BBC Micro
DOS
Daphne
Dragon32/64
Dreamcast
Family Computer Disk System
FinalBurn Neo
Game Boy
GameCube / Wii
MAME
Macintosh
Model 3
Neo-Geo
Neo-Geo CD
Nintendo 64
Nintendo 64DD
Playstation 1
Playstation 2
ScummVM
Super Nintendo
TI-99/4A
TRS-80 Color Computer
Thomson MO/TO
Tic-80
Virtual Boy
ZX Spectrum