I would love to understand this thing better

From: Chanda
Email: chanda_eckhoff@hotmail.com


I have got a 1979 Astro By Kosmo (serial number 116942) that is in great condition but I don't have an instructions manual. I am interested in it also because that was the year that I was born. If someone exactly how to use this vintage calculator, please let me know. Thank You, Chanda