La CASIO FX-180pv PROGRAMFX superFX de 1990. The Casio fx-180PV PROGRAMFX superFX is a programmable calculator with 10 digits precision 10+2+2 digits + function algebraic logic. An archetypical programmable calculator from Casio, the fx-180P has many of the distinguishing features found in the vast majority of non-graphing programmable Casio calculators.
eBay