Thought it might be fun to build some kind of instrument using the sound chip from the megadrive and some kind of microcontroller (arduino/xmos/...).
I must admit, I don't know much about electronics. Are these chips pretty rare now? The usual (UK) component shops (RS, Farnell) don't seem to stock them. Perhaps there is a similar chip on the market?
Could be easier to take the code from an emulator and do it in software.