Radio Shack EC-4020
| 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-4020
Over the years, Radio Shack released many OEM calculators under the Radio Shack or Tandy brand names. The EC-4020 is their OEM version of the Casio fx-4000P. It is certainly programmed the same way as other high-end Casio calculators, as demonstrated by the Gamma function implementation shown here.
"X=": ? -> X: 1 -> Y: Lbl 1: X >= 0 => Goto 2: X×Y -> Y: X+1 -> X: Goto 1: Lbl 2: e(ln ((1+(76.18009172+9.5E-9)/(X+1)-86.50532033/(X+2)+ 24.01409824/(X+3)-1.231739572/(X+4)+ 1.208650973E-3/(X+5)-5.395239384E-6/(X+6))× √(π×2)/X)+(X+.5)× ln (X+5.5)-X-5.5)/Y
