HP-35

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The HP-35 was a groundbreaking device developed by Hewlett-Packard and introduced on February 1, 1972. It has the distinction of being the world's first handheld scientific calculator, capable of performing trigonometric, logarithmic, and exponential functions.

Here are some key facts about the HP-35:

• Name Origin: The "35" in its name refers to the number of keys it had.
• Design and Size: It was designed to be small enough to fit in a shirt pocket, measuring 5.8 inches (150 mm) long and 3.2 inches (81 mm) wide.
• Functions: Besides the basic arithmetic operations (addition, subtraction, multiplication, and division), it could calculate trigonometric, logarithmic, and exponential functions, effectively making it the first electronic slide rule.
• Input Method: The HP-35 used Reverse Polish Notation (RPN) for entering calculations, rather than the algebraic method.
• Display: The calculator featured a red LED display capable of showing a 10-digit mantissa and a 2-digit exponent.
• Power: The HP-35 was initially powered by a rechargeable three-cell battery or a 115/230 V AC adapter, providing about three hours of battery life.
• Price: Its introductory price was US$395, which is equivalent to approximately $2,900 in 2023.
• Production: The original HP-35 was available from 1972 to 1975.
• Legacy: The HP-35 is considered a significant milestone in computing history, leading to the obsolescence of the slide rule. It was named an IEEE Milestone in 2009.
• Space travel: The HP-35 holds the distinction of being the first scientific calculator to be used in space in 1973 during Skylab 3 and 4 flights.

In 2007, HP released the HP 35s to commemorate the 35th anniversary of the original HP-35. The HP 35s, while a successor to the HP 33s, maintains many features of the original, including RPN input, but also offers algebraic infix notation and has additional features such as a two-line alphanumeric display and programmability.