sep 2, 1955 - HEWLETT PACKARD 9100A

Description:

Description: Hewlett packard 9100A is an early computer (or programmable calculator)

History: Development of the Hewlett-Packard 9100A started in 1965 in Palo Alto when a physicist named McMillian approached HP with a small calculator he invented. Tomas E. Osborne, another inventor, also approached HP with his own home-built calculator (when in 1971 the machine was patented (first application filed in 1966), namely Osborne was specified as an inventor—see the US patent 3623156). The best features of the two products were combined, and Osborne was hired as a consultant to continue the development work in HP Labs. The original size of the product was reduced by the invention of a PC board ROM by Chuck Near.

Special Features: Programmable scientific calculator, using RPN (Reverse Polish Notation) with a 3-level stack.
Uses a CRT (Cathode Ray Tube) to display the contents of the three registers.

Uses: The 9100A was the first scientific calculator by the modern definition, i.e., capable of trigonometric, logarithmic (log/ln), and exponential functions

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