Spotlight: Casio fx-95 US Equation
Welcome to another retro review.
Quick Facts
Model: fx-95US Equation
Company: Casio
Timeline: unknown, I’m guessing the 1980s
Type: Scientific Calculator
Number of Digits: 10
Power: 2 AA batteries (per manual)
There are also two variations of the fx-95US Equation:
fx-95 Equation
fx-500
The fx-95 US Equation and fx-95 Equation have a flip hard case, while the fx-500 does not. For the purposes of replacing the battery, I would have preferred the fx-500 case. The fx-500 requires two LR44 batteries.
Three Equation Modes
The fx-95 US Equation (and fx-500) is a basic, 10-digit scientific calculator with fractions. You have basic set of functions, including trigonometry, hyperbolic functions, random numbers, powers, roots, logarithms, and basic one-variable statistics.
The main attraction is the three equation modes:
MODE 1: QUAD (quadratic equation – real numbers only)
MODE 2: SIMUL-2 (2 x 2 linear system)
MODE 3: SIMUL-3 (3 x 3 linear system)
Entering coefficients and viewing answers happen by pressing the [ M+ ] key.
The fx-95 US does not allow for complex number solutions.
Examples:
x^2 + 5 × x + 6 = 0
Solutions: X 1: -2; X 2: -3
x^2 + 16 × x + 64 = 0
Solutions: x: -8 (repeated root)
-x^2 + 3 × x – 9 = 0
Solutions: 1: - E - (complex roots)
-2x + 3y = 5
x + 17y = 48
a1: -2, b1: 3, c1: 5
a2: 1, b2: 17, c2: 48
Solutions: X: 1.59459, Y: 2.72973
-x + z = 5
-2x – y – z = -3
3x + y – 2z = 1
a1: -1, b1: 0, c1: 1, d1: 5
a2: -2, b2: -1, c2: -1, d2: -3
a3: 3, b3: 1, c3: -2, d3: 1
Solutions: X: -6 ½, Y: 17 ½, Z: -1 ½
Check the left side as it will display the variable you are working with.
fx-95 US Equation vs. fx-260 Solar (II)
Comparison of Modes
Mode . (decimal point): SD
Mode 0: COMP
Mode 1: QUAD (fx-95 US Equation only)
Mode 2: SIMUL-2 (fx-95 US Equation only)
Mode 3: SIMUL-3 (fx-95 US Equation only)
Mode 4: DEG (SHIFT MODE 4 to convert to degrees, fx-260 Solar only)
Mode 5: RAD (SHIFT MODE 5 to convert to radians, fx-260 Solar only)
Mode 6: GRA (SHIFT MODE 6 to convert to grads, fx-260 Solar only)
Mode 7: FIX
Mode 8: SCI
Mode 9: NORM
The fx-260 adds the following functions: x^3, nCr, nPr.
The availability of the Casio fx-95US EQUATION is fairly good.
Source
Casio Computer Co, Ltd. fx-95, fx-500 Manual. Manual available on manualslib.com. https://www.manualslib.com/manual/358116/Casio-Fx-500.html#manual Retrieved January 20, 2024
Casio Ledudu. “CASIO fx-95US EQUATION” https://casio.ledudu.com/pockets.asp?type=1239&lg=eng
Eddie
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