The Motorola MC68882RC16A is a coprocessor in systems where MC68020 or MC68030 are CPUs. It works as a peripheral processor in cases where the CPU is MC68000, MC68008 or MC68010.   Replacement ...

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• Eight general-purpose floating-point data registers, each supporting a full 80-bit extended precision real data format
• A 67-bit arithmetic unit to allow very fast calculations, with intermediate precision greater than the extended-precision format.
• A 67-bit barrel shifter for high speed shifting operations
• Special purpose hardware for high speed conversion of binary real memory operations and from the internal extended format
• Reduced coprocessor interface overhead to increase throughput
• 46 instructions, including 35 arithmetic operations
• Full conformance to IEE 754 standard, including a full set of trigonometric and transcenental functions
• Seven data types: bytes, words and long-words integers; single, double, extended-precision real numbers and packed binary-coded decimal (BCD) string real numbers
• 22 constants available in the on-chip ROM including π, e, and powers of 10
• Virtual memory / machine operations
• Efficient mechanism for procedure calls, context switches and interrupt handling
• Concurrent instruction execution with the main processor
• Concurrent instruction execution of multiple floaying-point instructions
• Use with any host processor on an 8, 16 or 32 bit data bus

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