Rich, The formula parser doesn't support bignums. If it did, that would be an ideal solution. I do have some parser assembly code that I converted to nasm and linked to Xfractint. It runs, but produces a blank screen. For various reasons, I've been unable to get back to working on it. My current plans are to get my SDL port working a little better and then either linking this parser code or rewriting it using inline assembly in C. Jonathan
Are we just saying "its a precision issue" and throwing up our hands, or are we trying to achieve parity? If the former, then I guess there's no reason to continue the conversation; if the latter, then we should try to find out where/when we need more precision in the "C" code and go to bignums.
The parsers inherently operate at different precisions and when the level of zoom is high enough or the complexity of the calculations is high, there are going to be differences in the images generated.
I would have thought that bignums would kick in if it was a zoom issue.