The Texas Instruments SR-16 is a scientific calculator but lacks the trigonometric functions. It was produced and sold for a relatively short period of time and it is less frequently seen than other models.
Texas Instruments SR-16
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SR-16 Articles
AC Adapter AC9130A
Fully tested Texas Instruments AC adapter AC9130A. The adapter is used for a number of TI calculators among them SR-16, SR-50A, SR-51A, SR-52, SR-56, TI-2550 II, TI-2550 III (there are others too).