I've decided to start the work of upgrading my assembler to be 65816 compatible (which is used in the SuperCPU) as I fancy having a little play with 20Mhz of power! I know - Im jumping around quite a bit, but that happens as I try and keep my interest going. I'll probably play with this at lunchtimes at work, so I hope it won't get in the way too much. The 65816 is very neat and I've used it a lot in the past when doing SNES work (Lemmings2), its got full 16 bit registers although you can swap them back and forth. Its also got access to a full 16Mb of RAM (which my Super CPU has!) which could make for some REALLY cool stuff - lots of space for buffers and tables here! Also Zero page becomes DirectPage and it can move!! In Lemmings2 I pointed zero page at my graphics so that the code ran faster! I'll need to look out my SNES assembler manual to see the syntax I used in that, but all in all - it should be pretty good fun!
Edit: So I've just added my first new 65816 instructions! yeeeeeeaaa!!
I'm so happy... :) This does 24bit indirect addressing through the direct page register (the new movable ZeroPage)
You know something....the THOUGHT of filling even 4Mb with C64 graphics/sound is frightning.... On the SNES I had a ROM disk system, and most of the memory was taken up with that, but here... its RAM...so you cna actually DO stuff with it - outstanding! I may have to update my C64 emulator to allow 65816 code as well...Mmmm... even simple stuff without the need to fallback to 1Mhz for custom chips would probably do - I dont think anyones done a SuperCPU emulator before....
The other thing I didn't realise is that the 65816 is also 65c02 compatable...which means I can probably add 65c02 to the assembler as well...