Intel 80387 is a co-processor for 80386 microprocessor family. The 80387 runs at
the same speed as the 80386 and supports all execution modes of the main processor -
real, protected and virtual. Being fully object-code compatible with 80287 and 8087
co-processors, the 80387 has much greater performance due to a few factors:
- Higher co-processor clock frequency.
- Execution of optimized FPU instructions requires fewer clock cycles.
- Data bus is 32-bit.
The 80387 comes in two versions - 80387DX works with 80386DX processors, and
80387SX works with 80386SX CPUs.
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