My Harmony Cart arrived yesterday.
Since, I have started reading up on DPC+ bankswitching.
I bought the HC simply because I wanted to see the games I am developing on real hardware, but now I see that the features I want to add to Broomball will be so much easier (or even possible) with DPC+.
Quite frankly, I like the idea of writing the difficult logic parts of the game in C code rather than in assembly anyway.
Edit: Oh yeah - I forgot... I don't have my Atari system here. My mom has it. But hopefully, I'll get it today when I meet her for Xmas shopping. I can't remember which one she has. I think it's my 7800. The other systems I have are in storage somewhere.