Casio Fx 115s Battery
I recently purchased two calculators from: * Casio fx-115D SUPER-FX and * Radio Shack EC-4004 (I'll talk about this in another post). Date the fx-115D SUPER FX was first manufactured: about 1995, according to calculator.org ( I honestly thought this model was around in the late 1980s or early 1990s. Epson l220 resetter. Hard to tell when Casio does not date their user manuals. As with most solar-powered calculators, the fx-115D SUPER FX (herein referred to as fx-115D from this point forward) has a battery backup. This means we can store data and it will be retained after the calculator is turned off.
Casio Fx 115s User Manual
Casio
In addition to the independent memory (M), the fx-115D has six additional memory registers. The Kin key stores the number into one of the six registers, which the Kout key is the recall key. Better yet, the fx-115D supports storage arithmetic. Storage Arithmetic: Let # represents registers 1 through 6: Add x to #: x [ Kin ] [ + ] # Subtract x from #: x [ Kin ] [ - ] # Multiply x to #: x [ Kin ] [ × ] # Divide #/x: x [ Kin ] [ ÷ ] # Constant arithmetic operation keys are executed by pressing the arithmetic key twice. Then enter each operand then the equals key. I wonder if anyone used this feature?