Native VGM player for the NGP(C)

[mic_]

Is it all running on the Z80?

Since the sound data doesn't fit in the shared RAM all at once I send it over to the Z80 in small pieces. There's some code on the TLCS that routinely polls the Z80<->TLCS communications register to see how much of the data in the buffer the Z80 has consumed. If it's running low on data, the TLCS sends some more.

I suppose a better approach would be e.g. to let the Z80 trigger an interrupt on the TLCS side when the buffer is running low.

Are you planning on developing this further? A public release with the ability to compile a selection of tunes, perhaps?

That's the general idea. Though replacing the songs will probably require assembling the ROM yourself (I'm using AS for the TLCS code, and WLA-DX for the Z80 code).