Adam Wozniak wrote:
They're not pointers, they're declared unsigned char, and I've forced
the compiler to put them in the right spot.
No problem there, then...
cc65 (www.cc65.org) is a free compiler for the 6502
The rest is just magic with a hand written crt0.S and the linker config file.
I'm mostly interested in knowing if the "kernel loop" there was correct.
I don't have a plan (yet) for controlling timing. I figured I'd think about
that once the compiler was working. I realize that most of the cool tricks
are intimately tied to cycle counting, but part of the exercise is to see
what is (and isn't) possible with this toolset.
I suspect what you're going to end up doing here is creating
standardized kernels of various types in assembly and writing the game
logic in C to run during VBLANK. You're kernel looked OK to my casual
reading of the code, but I hesitate to say it's correct without
comparing it to one of the example assembly kernels and test-running it
on a real machine.
One option would be to require RAM (via an SC, for example) for a
display buffer and have the C kernel copy data over from that to the
hardware registers. Otherwise, timing's going to be a real bear.
--
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