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This paper describes the design and implementation of the NUMAchine multiprocessor. As the market for CC-NUMA multiprocessors expands, this research project provides a timely architectural design and cost-effective prototype. The key to the successful implementation of our 48-processor prototype is the use of off-the-shelf components and programmable logic devices. Since this machine will serve as a research vehicle for parallel software development, a number of hardware features to enhance experimentation have been included in the design.