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C5000 - The C5000 is a 12.8 oz. non-printing yellow construction calculator with an 8-digit LCD 8mm display. It uses 2 LR44 batteries for power and does the same functions as the C6000 . Different functions from the C6000 include, calculating gravel, bricks, boards, fencing, lumber, flooring, studs, tiles and paint.
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 ...
Solar-powered calculators are hand-held electronic calculators powered by solar cells mounted on the device. [1] They were introduced at the end of the 1970s. [2]Amorphous silicon has been used as a photovoltaic solar cell material for devices which require very little power, such as pocket calculators, because their lower performance compared to conventional crystalline silicon solar cells is ...
It is powered by 2 LR44 batteries or light. EL-506W adds matrix calculation, list calculation (max 4 lists, 16 elements/list) to EL-520W, for total of 469 functions. EL-500M is a single line version of EL-509W, which contains only the dot matrix line. Dot matrix line only shows 11 characters. Memory register is reduced from 9 to 1.
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 . The HP-18C was introduced in June 1986.