## Saturday, March 2, 2024

### Spotlight: Casio fx-95 US Equation

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 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

All original content copyright, © 2011-2024. Edward Shore. Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited. This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.

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