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Product Descriptions

The 80C286 is an advanced 16 bit CHMOS ll microprocessor designed for multi-user and multi-tasking applications that require low power and high performance. The 80C286 is fully compatible with its predecessor the HMOS 80286 and object-code compatible with the 8086 and 80386 family of products. in addition, the 80C286 has a power down mode which uses less power, making it ideal for mobile applications. The 80C288 has built-in memory protection that maintains a four level protection mechanism for task isolation, a hardware task switching facility and memory management capabilities that map 230 bytes (one gigabyte) of virtual address space per task (per user) into 224 bytes (16 megabytes) of physical memory.

The 80C286 is upward compatible with 8086 and 8088 software. Using 8086 real address mode, the 80C286 is obiect code compatible with existing 8086, 8088 software. in protected virtual address mode, the 80C286 is source code compatible with 8086, 8088 software which may require upgrading to use virtual addresses supported by the 80C286's integrated memory management and protection mechanism. Both modes operate at full 80C286 performance and execute a superset of the 8086 and 8088 instructions.

The 80C286 provides special operations to support the efficient implementation and execution of operating systems. For example, one instruction can end execution of one task, save its state, switch to a new task, load its state, and start execution of the new task, The 80C286 also supports virtual memory systems by providing a segment-not-present exception and restartable instructions.

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