Radio Shack EC-4023
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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Radio Shack EC-4023
Yet another Radio Shack OEM machine: this one is the Casio fx-5000F calculator in disguise. An excellent calculator with a generous 675-step formula memory, and 128 built-in scientific formulae that can be executed, or recalled into editable formula memory. Sadly, no branching or conditional execution capability is offered; an already useful machine, the EC-4023 would be one of my favorites with that kind of programming flexibility.
The roomy formula memory is more than sufficient to store a polinomial implementation of my favorite programming example, the Gamma function. Here it is again (this is the same formula I wrote for the fx-5000F):
(1+76.18009173/(Ans+1)-86.50532033/(Ans+2)+
24.01409824/(Ans+3)-1.231739572/(Ans+4)+
1.208650974E-3/(Ans+5)-5.395239385E-6/(Ans+6))
√2π/Ans×(Ans+5.5)xy(Ans+.5)/e(Ans+5.5)
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.