XSC 2.0

XSC is a port of the SC68 player for XMMS and Winamp into an Aqua application for Mac OS X. The XSC shell is made in Java and should hopefully work with any Mac OS X 10.3.x version, however only OS X 10.3.5-7 has been properly tested.
SC68 is a library of players for different chip music formats.

Mostly for Atari ST, but also some Amiga synths and Atari ST digisynths are supported. The main goal for porting SC68 to Mac OS X has been to be able to replay Atari ST native SNDH chipmusic files. SC68 is pretty capable of generating accurate results, but has some shortcomings (4-bit envelope volume which should be 5-bit for better accuracy).
XSC is freeware and open-source, please download a copy and start playing some oldskool sounding tracks. In the links section you can find links to various sites with music files to download.