LCD displays usually have black numbers against a silver background. With LED displays the numbers light up in red. I have divided the TI calculators by type of display, LED or LCD. The largest holdings are Texas Instrument (TI) calculators. The Calculator Museum is divided into several sections generally by manufacturer. Not having a calculator for math through grade 12 made me good at doing hand calculations, and gave me a great appreciation for calculators. I bought a Commodore scientific calculator while a freshman or sophomore at UC San Diego for $50 (see Vintage Technology Museum for an example) and a beautiful Sharp LCD scientific calculator (below) a year or two later for about $40 when the Commodore broke. My dad got the family a Sharp ELSI 8107 with basic operations when I was a senior in high school. I envied my friend's TI SR-50 scientific calculator which cost about $150 (about $800 in 2021 dollars). While I was in high school (1971-1975) the first pocket calculators came out. It did the difficult math we were doing almost instantaneously. I remember a man coming to my eighth grade math class in 1970 or 1971 and showing us a desktop electronic calculator costing hundreds of dollars. It contains over 140 calculators, starting with mechanical machines dating back to at least the 1920s to electronic pocket calculators beginning in 1970.
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