Saw a couple other calculator posts so I thought I'd post this old workhorse. Still use it pretty much daily. National Semiconductor 835A from 1979. : r/vintagecomputing
NATIONAL SEMICONDUCTOR -Vintage Calculator - Model NS100 JAPAN Tested Working | eBay
File:Vintage National Semiconductor (NSC) Model 750 Electronic Pocket Calculator, Red LED Display, Made In Hong Kong, Circa 1978 (15280418755).jpg - Wikimedia Commons
VINTAGE National Semiconductor 835A RED LED Calculator | eBay
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calculators\National Semiconductor 4615 - calculator.org
Calculator chip installed on integrated circuit macro, calculator isolated on white background Stock Photo - Alamy
Collectible National Semiconductor NOVUS CM IV Pocket Calculator With Case | eBay
Vintage National Semiconductor 103A Handheld Datachecker Electronic Calculator | eBay
File:Vintage National Semiconductor (NSC) Model 500 Electronic Pocket Calculator And Paper Printer, Made In Japan, Very Compact Calculator And Printer (14184865112).jpg - Wikimedia Commons
DATAMATH
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National Semiconductor NS-7100 | A collection of programmable and non-programmable calculators
Vintage National Semiconductor Electronic Pocket Calculato… | Flickr
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National Semiconductor 852 pocket electronic calculator | Science Museum Group Collection
MyCalcDB : Calculator National Semiconductor 835A
Criza semiconductorilor: O oportunitate pentru piața refurbished (P)
National Semiconductor Novus 835 Handheld Electronic Calculator | National Museum of American History
National Semiconductor 600
File:Vintage National Semiconductor (NSC) Electronic Pocket Calculator, Model 835, Red LED Display, Made In Malaysia, Also Branded As Novus (Made In Hong Kong), Circa 1976 (15290427975).jpg - Wikimedia Commons
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Virtual Museum of Calculators
National Semiconductor 99 Handheld Electronic Calculator | National Museum of American History
