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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.
Is the first pocket calculator with a numeric range that covered 200 decades (more precise 199, ±10 ±99). [5] The LED display power requirement was responsible for the HP-35's short battery life between charges—about three hours.
The user has a solver (another HP first) available, but only had about 1.5 KB of continuous memory available to store equations. The calculator has many functions buried in a menu structure. The clamshell design is fairly robust, but the battery door is the shortcoming of this whole line; 18C, 19B, and 28C/S models .
Lucas from San Mateo, CA, tells Kelly Clarkson how he created a real-life time machine! He documented his entire life for a year with Spectacle glasses and then took the footage and imported it ...
height: 0.7–1.4 inches (18–36 mm) 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.
The HP-45 is the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35. It was introduced in 1973 [1] with an MSRP of US$395 [2] (equivalent to $2,711 in 2023). [3] Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.
Brunsviga 15 Mechanical Calculator Original Odhner-Arithmos-Typ-5. Brunsviga is a calculating machine company whose history goes back to 1892 with devices upgrading from mechanical to electrical thereafter. The firm Grimme & Natalis that manufactured the machines changed their name to Brunsviga Maschinenwerke A.G. in 1927.
One notable deficiency of the HP-25/25C was the lack of a subroutine capability, at a time when the TI-58 and even the earlier SR-56 had subroutines. Although 49 fully merged keycodes were roughly equivalent to the unmerged 100 steps of the SR-56; by the time the TI-58 arrived with 480 steps, subroutines, DSZ loops, etc., the HP-25/25C had ...