The SR-50 was Texas Instruments' first scientific pocket calculator with trigonometric and logarithm functions. It enhanced their earlier SR-10 and SR-11 calculators, introduced in 1973, which had featured scientific notation, squares, square root, and reciprocals, but had no trig or log functions. 

This model was a hybrid between the well known SR-51A and the later TI-55. 

The SR-51-II was a powerful, full-functioning calculator is ideal for the advanced high school student to grow with into college and career. It offers solutions to simple arithmetic as well as trigonometric, logarithmic, and hyperbolic functions. It performs all the classical slide-rule functions and more: roots and powers, factorials, reciprocals, percent and percent-change, linear regression and trend-line analysis. Students can use the SR-51-II to help them with complex statistical problems as well: mean, variance, standard deviation and correlation among with seven unit conversions by direct key. It has three addressable memories with direct memory arithmetic and memory/display exchange.

TI’s AOS algebraic operating system allows complex mathematic expressions to be entered in the same order that they are written. Up to nine levels of parentheses are available to ensure proper and accurate interpretation of expressions. And, it handles up to five pending operations.

A fixed decimal option provides results displayed to as many as eight decimal places at directions of user. And, the SR-51-II can state numbers in scientific or engineering notation.

Serial number 0023788 LTA 3876 assembled in the USA and was kindly donated by Francis Hookham.

Manufacturer: Texas Instruments
Date: 1976

This exhibit has a reference ID of CH31289. Please quote this reference ID in any communication with the Centre for Computing History.

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