"The TI-1766 had solar cells that eliminated the need for batteries and powered the calculator indoors and out." See http://www.thocp.net/hardware/ti_calculators.htm
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Texas Instruments TI-30xIIS calculator?
How to add fractions on a texas instruments TI-81
The t1-84+ has the addition of a usb cable and preloaded apps.
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Texas Instruments. which is the company that makes the calculators that say T.I.