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IBM began shipping its largest computer.

Jumping its own schedule, International Business Machines shipped the first upgrade for its 3090 Model 400 mainframe, which it bills as the most powerful generally available, general-purpose computer in the world. IBM had originally said shipments of the big mainframe would begin in the April-June period of 1987 but had recently been indicating to analysts that shipments would begin around the beginning of October of this year. The first Model 400 will be placed at A. C. Nielsen Co. in Green Bay, Wis.

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