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NCR 18-1 Desktop Calculator

Image Courtesy Ian Ormerod

"Little Brother" machine to the NCR 18-2, and NCR 18-3 calculators, introduced a bit lataer (early 1969) than these two earlier machines. 14-digit capacity using individual seven-segment gas-discharge display tubes, with first usage of "half-sized" zeroes for leading zero display. One accumulating memory register. Four function, with fixed decimal point settings. Utilizes Fairchild small-scale DTL integrated circuits, along with early Fairchild MOS shift register ICs for working register storage. This machine was manufactured by Nippon Calculating Machine Co. (Busicom), and sold under OEM license by NCR in North American markets. Sold by Busicom in Japan as the Model 141DA.