Some notes on common and uncommon error messages from AutoCAD 386. A page table matches the logical order of pages against their location in the computer's memory. A page is 4K in size and can hold code or data. When disk space is low, or when the swap file has grown to its maximum size, the program must perform a by deleting old data and writing new data in its place. A high value for swap reclaims means the program is spending too much time sorting through the swap file.
Unmapped pages are virtual pages which are neither in physical memory nor on disk.
The above happens when the page table contains a listing for an address that is in the wrong format or is impossibly large. A cache controller may have dropped a bit, for example, or it returned a bad value. There are many ways the processor can be told to execute the wrong program address. The processor forgets where it was before the interrupt happened. Unexpected processor exception occurred.