M65MP: An experiment in OS/360 multiprocessing

The System/360 Model 65 multiprocessing system (M65MP) described in this paper exists and is in operation at the IBM facility in Gaithersburg, Mary - land. The Gaithersburg programming effort is the base for IBM's support of multiprocessing announced on January 3, 1968. The only purpose of this paper, however, is to relate strictly personal observations about the development period and the results accomplished.