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9500 - The 9500 is a black 3.2 oz desktop calculator that uses LR1130 batteries. It has a selectable rounding switch and selectable decimal switch. This calculator also includes 3-key independent memory and is made with 50% recycled plastic. [19] 9700 - The 9700 is a black 9.6 oz desktop calculator with a 12 digit tilted LCD display. It has ...
The HP-18C is HP's first RPL-based calculator internally, [1] even though this was not visible on user-level in this non user-programmable model. 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 internal hardware of the HP-12C changed again in 2015, when the design switched to use an Atmel ATSAM4LC2CA-AU processor with ARM Cortex-M4 core. [2] The calculator's part number and physical appearance didn't change except for a "Rev 2" plate on the bottom side. [2] It continues to use two parallel CR2032 cells. [2]
The calculator uses the proprietary HP Nut processor produced in a bulk CMOS process and featured continuous memory, whereby the contents of memory are preserved while the calculator is turned off. [13] Though commonplace now, this was still notable in the early 1980s, and is the origin of the "C" in the model name.
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.
When interchanging magnetic cards between the HP-67 and the HP-97, the calculators' software took care of converting the key codes, and emulated the 97's print functions through the 67's display. The HP-67 is powered by a pack of three AA-sized nickel-cadmium rechargeable batteries. Owing to the power requirements of the built-in thermal ...