zBoy is an open-source, multi-platform emulator of the GameBoy Classic handheld console (also known as the "DMG"). Today I finished the sound support implementation.
Here we can see the DOS version running the Adventure Island II ROM on a Pentium II 300 MHz PC.
I am happy with how it works now. A formal zBoy release (v0.70) is to be expected soon.
http://zboy.sourceforge.net