Re: Memory trashing? Virtual memory question.

Main memory (DRAM of some type) is the new hard disk.
The difference in speed between cache and main memory looks a lot like the difference between main memory and hard disk did a few decades ago. So if you thrash the backing store, operation will slow down.
Potentially complicating things are an OS. Is this Forth running bare metal on the AMD with no OS? If there is an OS then all sorts of memory management issues appear.
If you need more memory space than you have physical memory, it will seem as if your backing store is a tape drive. :-)
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David Schultz