Casio fx-7000G
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-7000G
The fx-7000G is a notable calculator: along with the fx-6000G, this was the first graphing calculator that appeared on the market in the mid-1980s.
The machine's roots are unmistakable. Whereas later graphing calculator models have many computer-like features, the fx-7000G retains many of the characteristics of earlier, non-graphing calculators. The use of a MODE key for switching to program mode, for instance, is common to many Casio pocket calculators, whereas the use of ten program "slots" is familiar to anyone who used a Casio BASIC handheld computer.
By far the most significant limitation of this calculator is its small memory: less than half a kilobyte available for programs and data. That said, this does not make the machine as limited as one might believe, thanks to efficient (tokenized) program storage.
The following example is an implementation of the Gamma function using the classic recipe from the book, Numerical Recipes in C:
"X=":?->X 1->Y Lbl 1 X>=0=>Goto 2 XY->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