About frist scientific calculator powered by solar cells and button cells

[Thomas Okken]

(08-17-2017 01:25 PM)Alevin Wrote:  

(08-16-2017 11:42 AM)Didier Lachieze Wrote:  In 1972 the Sinclair Executive was using button cells batteries (3 or 4 depending on the version).

If you're looking for the first calculator powered by solar cells without any battery, it seems to be the TEAL Photon from 1977, but in 1976 the Sharp EL-8026 and the Royal Solar I / Triumph-Adler 1980 were using solar cells to recharge the internal batteries.

Thanks for the contribution, these data are found elsewhere, but I was asking fpr Scientific type calculators, not general 4 basic function calculators.

The first scientific solar-powered calculator that I remember seeing was the original TI-30 Solar, but Wikipedia tells me that was in 1987. Surely that can't have been the first?