About frist scientific calculator powered by solar cells and button cells

[Didier Lachieze]

(08-17-2017 01:25 PM)Alevin Wrote:  Thanks for the contribution, these data are found elsewhere, but I was asking fpr Scientific type calculators, not general 4 basic function calculators.

Sorry, I missed the “scientific” part of your question. I don’t know the exact answers but my candidates would be:

• first scientific calculator powered by button cells : Sharp EL-5804/5805/5806 or Casio fx-2000 from 1977
• first scientific calculator powered by solar cells : Sharp EL-510/EL-515 or Casio fx-900/fx-950 from 1982. There are several others from 1982 such as the Toshiba's SLC 8410 or TI 30 SLR, but looking at the size of the solar cells, the Sharp and Casio models seem to be the older ones as older cells were bigger and less efficient than newer ones.

Other people may have better candidates…