Nippon Calculating Machine Co. Busicom 162 Desktop Calculator
Nippon Calculating Machine Co. Busicom 162
Image Courtesy Peter Broughton of Broughton's of Bristol (UK Busicom
Distributor in the 1960's)
Interestingly, though manufactured in Japan, the Busicom 163 utilizes
small-scale DTL Integrated Circuit logic manufactured by American
integrated circuit manufacturer Signetics.
The use of Signetics integrated circuits in a Japanese-made calculator
is unusual, and occurred in this case because the calculator
was designed under contract to Nippon Calculating Machine Co.(NCM)
by Computer Design Corporation in the United States (Santa Monica, California).
NCM provided overall desired specifications and performance documentation
and Computer Design Corporation desgined the calculator, providing complete
details for NCM to use to produce the calculator.
Issues relating to Japan's limits on import of US-made integrated circuits
were skirted by the fact that NCM had arranged an OEM agreement with
National Cash Register in the US, which allowed NCM to be able to import
the US-made integrated circuits in order to fulfill its contractual
oblications under the OEM agreement with NCR.
NCR marketed this calculator
as the NCR Model 18-3 in
Along an automatic square root function, the Busicom 162/NCR 18-3
provides two independent accumulating memory registers, fixed decimal
point for addition/subtraction with floating decimal for results of
multiplication and division, 16-digit capacity, a backspace feature for
error correction, true credit balance, and selective round-off features.
The calculator uses a 256-bit magnetic core memory array for
working register storage. See the Old Calculator Museum
exhibit on the NCR Model 18-2 for
information on a variant (leaving out the square root function) of
the 162 also marketed by NCR.
NCM/Busicom 162 Specifications
||Nippon Calculating Machine Co., Ltd.
||Computer Design Corporation, Santa Monica, CA
||National Cash Register, Dayton, OH
|NCR Model Number:
|Date of Introduction:
||Nixie Tube, 16 Digits
||Small-Scale IC logic (Signetics DTL) mixed with discrete diode/transistor circuitry
||256-bit (16x16) Magnetic Core Memory array for working register storage
|Digits of Capacity:
||Thumbwheel-selectable fixed for addition/subtraction, floating for multiplication,
||division and square root.
||Four Function plus Square Root
||Two accumulator-style memory registers w/automatic summation mode
||Addition/Subtraction: 20ms; Multiplication/Division/Square Root: 430ms max. (Mfg. Claims)
||13 1/8" wide, 13 1/8" deep, 5 5/8" high
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