計數架生
閱讀設定
計數工具係攞嚟計數嘅工具。
史
[編輯]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[1],1972年惠普推出第一款掌上科學計算器HP-35。
計數機
[編輯]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。
攷
[編輯]- ↑ 我們在燃燒 鮑勃•約翰斯通 華夏出版社 2004年 ISBN 7-5080-3534-8
出面網頁
[編輯]- 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[失咗效嘅鏈]
- 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