Just had a quick thought, Little-scale and Mr Spastic have both release albums with songs combining various different chips. I have seen little-scale use Mastersystem/Megadrive and 2600 all together and MR S uses Gameboy/c64/NES, I am very gently dipping my toes into SID/opl3/Megadrive stuff which is working nicely.
I realized how much chipmusic seems to be single platform, ie all gameboy or all amiga or whatever. Anyone else mixing different chips in the same song? Blends or sound pallets you really like? I am keen to try Megadrive and NES, I think that will sound great!