HP 12 C
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Sivulka: Excel reached 90% finance market penetration in 18-24 months
“If you look at finance and how fast, ah, Excel went to 90% market penetration in finance. 1985 to 1986. Literally 18 months to 24 months, Excel took over all of finance. Everyone switched from using a calculator, the HP 12 C, to using Excel.”