Callus is a Capcom system 1 emulator(duh, title). I'll provide links to sites about Callus and the emulator, so have fun...
Now you can play street fight 2 and final fight!!!!
 

Callus: 0.42  -Quite Fast, excellent sound, perfect gui...COOL!-
                    By the maker of Nesticle and Genecyst.
                    There is a windows version, but it is slower and crashes more.
                    If you want the win95 (direct X) version ,simply email
 

French page with all the roms currently running  on callus-Good

Callus homepage-Download only.

With this, you should callus alright...