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Any tips on how to make c code as small as possible?



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C doesn't really fit a 6502. It's a byte orientated CPU. Adding 2 16 bit words takes 19 bytes.  There's no way round it that doesn't eat CPU cycles, even clever allocation and deallocation of zero page isn't that effective.

So :

  • do as much byte work as humanly possible
  • try to avoid stack frames - no parameters, locals. Make your locals static.
  • try and use zero page.
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