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HP-65 in original hard case with manuals, software "Standard Pac" of magnetic cards, soft leather case, and charger The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [ 1 ] (equivalent to $5,069 in 2024) [ 2 ] , it featured nine storage registers and room for 100 ...
Smaller programmable model with programs up to 49 steps. Version HP-25C was first calculator with "continuous memory". HP-27S: 1988 The first HP pocket calculator to use algebraic notation only rather than RPN. It was a "do all" calculator that included algebraic solver like the HP-18C, statistical, probability and time/value of money ...
The operation and performance of the EL-8 are identical to its predecessor calculators, the QT-8D and QT-8B, because its logic circuits use the same set of four Rockwell-manufactured large-scale integrated circuits. [1] [2] [8] Likewise, its keyboard has the same layout, including the combined ×÷ key, [1] [2] and it also uses magnetic reed ...
The calculator had a four-register stack (x, y, z and t). The stack was represented in the operating manuals with the t register at the top, followed by the registers z, y, and x. The "enter" key pushed the displayed value (x) up the stack. Any binary operation popped the bottom two registers and pushed the result.
The 22S has the same physical form factor and 37-key keypad as other models in the Pioneer series. Introduced simultaneously with the HP-32S , [ 1 ] it is based on the same hardware, with a single line character-based dot matrix display that can display both numerical and alphabetical characters.
The following table compares general and technical information for a selection of common and uncommon Texas Instruments graphing calculators. Many of the calculators in this list have region-specific models that are not individually listed here, such as the TI-84 Plus CE-T, a TI-84 Plus CE designed for non-French European markets.
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