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2. HP 35s - Wikipedia

   en.wikipedia.org/wiki/HP_35s

   The HP 35s (F2215A) is a Hewlett-Packard non-graphing programmable scientific calculator. Although it is a successor to the HP 33s, it was introduced to commemorate the 35th anniversary of the HP-35, Hewlett-Packard's first pocket calculator (and the world's first pocket scientific calculator). HP also released a limited production anniversary ...

3. HP-22S - Wikipedia

   en.wikipedia.org/wiki/HP-22S

   The HP-22S is an electronic calculator from the Hewlett-Packard company which is algebraic and scientific. This calculator is comparable to the HP-32S. A solver was included instead of programming. It had the same constraints as the 32S, lacking enough RAM for serious use. Functions available include TVM and unit conversions.

4. TI-30 - Wikipedia

   en.wikipedia.org/wiki/TI-30

   The original TI-30. The TI-30 is a scientific calculator manufactured by Texas Instruments, the first model of which was introduced in 1976.While the original TI-30 was discontinued in 1983 after several design revisions, TI maintains the TI-30 designation as a branding for its low and mid-range scientific calculators.

5. HP-35 - Wikipedia

   en.wikipedia.org/wiki/HP-35

   The HP-25 was a smaller, cheaper model of a programmable scientific calculator without magnetic card reader, with features much like the HP-65. The HP-41 C was a major advance in programmability and capacity, and offered CMOS memory so that programs were not lost when the calculator was switched off.

6. TI-89 series - Wikipedia

   en.wikipedia.org/wiki/TI-89_series

   This option is generally preferred as it requires no knowledge of the program, works without the need of the program's source code, is automated, and doesn't require additional computer software. In some cases, only one character needs to be changed (the ROM base on TI-89 is at 0x200000 , whereas the TI-89 Titanium is at 0x800000 ) by hand or ...

7. Scientific calculator - Wikipedia

   en.wikipedia.org/wiki/Scientific_calculator

   Casio fx-77, a solar-powered digital calculator from the 1980s using a single-line LCD. A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic (addition, subtraction, multiplication, division) and advanced (trigonometric, hyperbolic, etc.) mathematical operations and functions.