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I'm getting Class B Illegal word operand access trap on a C161 board and I don't know why. The problem is reproducable, but moves unpredicatably as I modify the code. My trap handler spits out the top three stack entries, but they don't look credible, and the system continues running after the trap without visible problems. Short of hiring an ICE, does anyone have any advice?
I've sorted it now. Looking at the registers was the crux of the problem, as it's not easy to unwind the stack to find the instruction which generated the trap. Once my trap handler did this correctly, I could make some progress.