Sound like your program is either too large for the calculator or it's producing too much data. Limit the number of loops to *some maximum to avoid overflowing memory, and/or reduce the size of your program. * I don't recall the memory limits on these calculators, so you're on your own via manual or web search for particulars. best wishes
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In some of the older computers you had to do a garbage collection or all the old memory used would fill up. Garbage collection would clear memory of all the trash and free up the memory again.