DESCRIPTION
The 80C286/883 has built-in memory protection that supports operating system and task isolation as well as program and data privacy within tasks. The 80C286/883 includes memory management capabilities that map 230 (one gigabyte) of virtual address space per task into 224 bytes (16 megabytes) of physical memory. The 80C286/883 is upwardly compatible with 80C86 and 80C88 software (the 80C286/883 instruction set is a superset of the 80C86/80C88 instruction set). Using the 80C286/ 883 real address mode, the 80C286/883 is object code compatible with existing 80C86 and 80C88 software. In protected virtual address mode, the 80C286/883 is source code compatible with 80C86 and 80C88 software but may require upgrading to use virtual address as supported by the 80C286/883’s integrated memory management and protection mechanism. Both modes operate at full 80C286/883 performance and execute a superset of the 80C86 and 80C88 instructions. The 80C286/883 provides special operations to support the efficient implementation and execution of operating systems.
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