計數架生

計數工具係攞嚟計數嘅工具。

史

算盤

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。

1970年代嘅計數機

1970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Busicom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

内文：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。

出面網頁

• 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