ADDING_FOUR_FU_NCTlONS

Published:2009/7/3 5:12:00 Author:May | From:SeekIC

Capability of 8-digit four-function Novus 850 calculator made by National Semiconductor (also marketed as Montgomery Ward P50) can be doubled by adding four SPST swhches and connecting as shown. These provide additional functions of memory store, memory recall, percent, and constant. Switches can be put on front panel above display, at corners of battery. Cutler Hammer SA1BV20 SPST switches with SW53AA1 caps can be squeezed in.-D. Amett, Add Memory, Constant and % to a 4-Function Calculator, EDN Magazine, Aug. 20, 1975, p 82.



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