Casio fx-5500
Datasheet legend
Ab/c:
Fractions calculation
AC: Alternating current BaseN: Number base calculations Card: Magnetic card storage Cmem: Continuous memory Cond: Conditional execution Const: Scientific constants Cplx: Complex number arithmetic DC: Direct current Eqlib: Equation library Exp: Exponential/logarithmic functions Fin: Financial functions Grph: Graphing capability Hyp: Hyperbolic functions Ind: Indirect addressing Intg: Numerical integration Jump: Unconditional jump (GOTO) Lbl: Program labels LCD: Liquid Crystal Display LED: Light-Emitting Diode Li-ion: Lithium-ion rechargeable battery Lreg: Linear regression (2-variable statistics) mA: Milliamperes of current Mtrx: Matrix support NiCd: Nickel-Cadmium rechargeable battery NiMH: Nickel-metal-hydrite rechargeable battery Prnt: Printer RTC: Real-time clock Sdev: Standard deviation (1-variable statistics) Solv: Equation solver Subr: Subroutine call capability Symb: Symbolic computing Tape: Magnetic tape storage Trig: Trigonometric functions Units: Unit conversions VAC: Volts AC VDC: Volts DC |
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Casio fx-5500
This beautiful little calculator is a surprising machine. Like many other Casio calculators, it has a formula memory, which qualifies it as a simple programmable device (albeit without conditional execution or branching capabilities.) However, in addition to storing and executing formulae, this machine can do something few other calculators can: it can symbolically manipulate formulae. It can expand, factor, and simplify formulae, and also solve linear or quadratic equations. Not bad!
The limitation of each formula to 79 steps is, however, quite a drawback. Because of this, I see no way to implement my favorite, the Gamma function. Stirling's formula, on the other hand, fits easily:
(Ans^Ans/eAns)√2πAns×(1+1/12/Ans)
The method used here makes the formula operate on the result of any previous calculation, rather than prompting for the values of any independent variables.