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A special backup battery would ensure that the memory was not lost while the main batteries were changed. Battery removal and replacement had to be completed in a relatively short time. For example, with the HP 35s, battery replacement had to be completed in less than 2 minutes after removal. [11]
RPL comes in two flavors: User RPL and System RPL. User RPL is the language that a user can program directly on the calculator. System RPL requires an external compiler; this may be done on the calculator with a third-party utility, or on another machine. The two languages vary mainly in the number of low-level operations available to them.
A dual-powered (battery and solar cells) algebraic scientific calculator with 2-line dot matrix and segment display. HP-11C: 1981 Scientific Programmable, including hyperbolics, gamma function, statistical functions, and random number generation. HP-10s: 2007 A scientific calculator with more than 240 built-in functions, with 2 lines × 10 ...
The HP-67 is a magnetic card-programmable handheld calculator, introduced by Hewlett-Packard in 1976 at an MSRP of $450. [1] A desktop version with built-in thermal printer was sold as the HP-97 at a price of $750. [2] Collectively, they are known as the HP-67/97. [3]
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HP-19C calculator HP-29C with AC-powered battery charger. The HP-19C and HP-29C were scientific/engineering pocket calculators made by Hewlett-Packard between 1977 and 1979. They were the most advanced and last models of the "20" family (compare HP-25) and included Continuous Memory (battery-backed CMOS memory) as a standard feature.
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Battery life for the primary power cells ranges from 300 hours (LR03 battery) to 200 hours (R03 battery) for continuous display of main menu. Backup cells last up to about 2 years each. The calculators weigh about 190 grams including batteries , and measure about 19.7 mm x 83 mm x 176 mm. Features include scientific calculations , including ...