計數架生

計數工具係攞嚟計數嘅工具。

史 

早期嘅計數工具係純手動，例如算盤、算籌同計算尺。算盤通常係以可以上下滑嘅珠整嘅。算盤喺印度阿拉伯數字流行前用咗幾個世紀，而喺近代中國嘅會計同商務上都重有用。後嚟就有機械計數機。

20世紀70年代開始，微處理技術畀人用咗落整計數機嘅模式度，最初嘅微處理器係Intel喺1971年日本叫做嘅公司整嘅，1972年惠普推出第一款掌上科學計算器HP-35。

計數機 

以前有啲計數機好似今日嘅電腦一樣大，第一個機械計數機係檯上面嘅型機械裝置，但係好快就畀電力機械計數機取代，之後又畀真空管、電晶體、積體電路邏輯線路等嘅材料取代。今時今日大部分計數機都係一個手掌咁細個嘅微電子裝置。

攷

On TI's US Patent No. 3819921 – From TI's own website
 30th Anniversary of the Calculator – From Sharp's web presentation of its history; including a picture of the CS-10A desktop calculator
 The Old Calculator Web Museum
 Calculator Museum
 Museum of Soviet Calculators
 Soviet Calculators Collection
 Vintage Calculators
 The Museum of HP Calculators
 MyCalcDB 70's and 80's calculators database
 Pico and General Instrument's Single Chip Calculator processor
 A thorough analysis of the HP-35 firmware including the Cordic algorithms and the bugs in the early ROM.
 www.HEXelon.com math calculator with units of measure and currency converter
 12Calc.com – Universal programmable calculator covering mathematics, units of measure and realtime currency.
 WebCalc
 Online Calculators and Converters
 Online Calculator Software
 Online deep space SETI range calculator
 JavaScript Scientific Calculator – Scientific notation, hex, octal, decimal, binary, and mathematical functions; requires JavaScript (from ostermiller.org)
 GraphCalc – an Open Source graphing calculator program
 Console Calculator – powerful scientific calculator program
 Online math tool - powerful online mathematic calculator.
 John's Javascript RPN Sci-Calculator (complex number capable)
 Online calculator that could process symbolic equations and plot 2d and 3d functions graphs

計數機