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A Multiple Processor System for Acquisition and Analysis of Nuclear Physics Data

A data acquisition/analysis system for nuclear physics experiments using an array of three single-board computers has been constructed and tested. The computers, each containing a Motorola 68000 CPU, are coupled together on the commercially available VMEbus, and communicate to a host PDP-11/55 via a DMA link. A specialized operating system has been written for the multiprocessor array, which works in conjunction with an existing generalpurpose data acquisition program. The system has been in use for several months at the University of Pennsylvania Tandem Accelerator Laboratory for on-line experiments and replaying of data. In actual operation, each processor provides approximately the same computing power as a PDP-11/55, and the execution speed of the array is found to be proportional to the number of processors used.