Texas Instruments SR10 

Texas Instruments SR10 Distinctive features: The first of a line of Texas Instruments "Slide Rule" models. Technical details:Display is red LED, with scientific notation giving 8digits mantissa and 2 digits exponent. Semiscientific "Slide Rule" functions. Main integrated circuit  Texas Instrument TMS0120NC. 3.6v (3x AA rechargeable cells). 76 x 158 x 37 mm (3.0 x 6.25 x 1.5"). Made in U.S.A. Introduced in November 1972, with a direct mail price of US$149.95. Following on a couple of months after its first calculator, the 4function TI2500 Datamath, Texas Instruments introduced the SR10, its first electronic "Slide Rule" calculator. At the time most scientists and technicians used a mechanical slide rule for calculating, such as the small pocket example below. 

The Texas Instruments SR10 has semiscientific functions, comparable to the capabilities of a mechanical slide rule, though initially at about ten times the cost. There followed from Texas Instruments, and many other companies, more models of electronic slide rules, with increasing capability and reducing price until within a couple of years the mechanical slide rule became obsolete. 






Vintage Calculators 

© Text & photographs copyright Nigel Tout 20002014 except where noted otherwise. 