|Model:||CD 90 Sigma|
|Batteries:||AA x 3|
Introduced: ca. 1976
Scientific calculator with statistical functions and memory.
I couldn't check all its functions so that's about all I can tell about it. This one is broken...
It's not my habit to add broken calculators to my collection, but on this occasion the beauty of the calculator won. Both the "F"-key and the "√"-keys don't work. The problem is somewhere inside the keyboard because there are no broken connections within the rest of the calculator's circuits. There's a small fracture in the PCB of the keyboard which I can not fix because the keyboard is in a sealed compartment which wil take some courage to open.
©2023 Ernst Mulder