As (yet another) side project to all this Z80 work, I've also decided to have a stab at the Japanese Master System's FM chip. It's a YM2413, and the documentation on it is fairly tricky to get to grips with - not only thanks to it being in typical Japanese-manual English.

So far, I have this - the VGM player is a bit buggy and extremely primitive (unfinished), but should be enough to demonstrate the current state of the OPLL. You'll need an FM VGM to try it with - the Space Harrier demo from the BIOS sounds pretty good.

If anybody has had any experience with the YM2413, I'd be interested to hear if you had any helpful tips...

In other news, I've been adding multipage program support to Brass, and Latenite has had a lot of debugger integration work done on it. It's still a long slog before it's in a presentable state, sadly.