A coprocessor instruction interface is described which provides a flexible degree of coupling with a host control processor. Specific methods are defined for architectures to make use of multiple coprocessing instruction interfaces with a single coprocessor for supporting client-server coprocessors (CSCOPs). A dynamic debug interface is used in each coprocessor instruction interface to support tightly coupled, loosely coupled and firmly coupled operation of the single conprocessor for a corresponding coupled control processor.

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> Method and apparatus for dynamic modification of microprocessor instruction group at dispatch

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