Those people that are interested in chipmusic will no doubt be aware of the recent release of the highly-anticipated Chipsounds. Although I have not had a lot of time to deal with the software, I have been really impressed by both the quality of the emulation as well as the ease of use.
Here is a recording of the SN76489 (found in the Sega Master System). There are two identical phrases. The first phrase is played by the Chipsounds. The second phrase is played on the Sega hardware.