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On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [ 1 ] [ 2 ] [ 3 ] On an expression or formula calculator , one types in an expression and then presses a key, such as "=" or "Enter", to evaluate the expression.
For use with a shorter keyboard or laptop which omits the numberpad Bluetooth numeric keypad, working also as calculator. A numeric keypad, number pad, numpad, or ten key, [1] [2] [3] is the palm-sized, usually-17-key section of a standard computer keyboard, usually on the far right. It provides calculator-style efficiency for entering numbers.
David Sundstrand (1880-1930) was a Swedish-born American inventor of the 10-key adding machine, 10-key calculator keyboard, a 10-keypad now used on computer keyboards, and a co-founder of Sundstrand Corporation. Sundstrand's 1914 adding machine had the first now common place keyboard for 10-key calculators and numeric keypads.
The first key-activated mechanical calculators and many cash registers used "parallel" keys with one column of 0 to 9 for each position the machine could use. A smaller, 10-key input first started on the Standard Adding Machine in 1901. [9] The calculator had the digit keys arranged in one row, with zero on the left, and 9 on the right.
The last ANITA machine with a Comptometer keyboard was the ANITA mk 10 introduced in 1965, still using cold-cathode switching tubes and that will be replaced in 1968 by the ANITA mk 11, a 10 key machine. Sharp's first all transistor desktop calculator, the CS-10A COMPET, introduced in the summer of 1964, also had a Comptometer type keyboard.
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[10] [11] In June 1982, the "Calculator: Instruction Manual" book was printed by the APX, noted with "User-Written Software for Atari Computers" on the cover, and the program got product ID number APX-20130. [12] In the same year, product CX-8102 was listed in the "Atari Home Computer Product Catalog". On the screenshot, printed in color in the ...
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