National Semiconductor Corp. announced that it will...

National Semiconductor Corp. announced that it will restructure its Information Systems Group and reduce its ISG work force by about 450 people. As a result, the Santa Clara, Calif., company will incur a one-time charge of about $18 million in the first quarter of fiscal 1989. As the major element of this restructuring, Datachecker Systems announced that it will withdraw the Series 3000, a programmable retail system, from the marketplace. Datachecker also announced plans to consolidate marketing and engineering functions currently based in Littleton, Mass.; Phoenix, and Santa Clara into one organization in Santa Clara.