Douglas E. Morrissey

Computer system and method for operating multiple operating systems in different partitions of the computer system and for allowing the different partitions to communicate with one another through shared memory

Computer system including plural caches and utilizing access history or patterns to determine data ownership for efficient handling of software locks

Serial I/O channel having dependent and synchronous sources of control data and user defined data

System and method for avoiding deadlocks utilizing split lock operations to provide exclusive access to memory during non-atomic operations

Message flow protocol for avoiding deadlocks

Directory-based cache coherency system supporting multiple instruction processor and input/output caches

I/O subsystem with header and error detection code generation and checking

Serial I/O channel having independent and asynchronous facilities with sequence recognition, frame recognition, and frame receiving mechanism for receiving control and user defined data

System and method for providing speculative arbitration for transferring data

A MEMORY ADDRESS TRANSLATION SYSTEM AND METHOD FOR A MEMORY HAVING MULTIPLE STORAGE UNITS