Casio FX-702P
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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I believe that the FX-702P was one of the very first BASIC programmable handheld calculators made by Casio. This early machine has several unique distinguishing features. First, its external interface is a 7-pin plug that is identical to that used on the fx-602P, and decidedly different from the wider plugs used in many later machines. Second, its programming model: it includes non-standard keywords such as INP or PRT, and a rich set of scientific functions (e.g., hyperbolic functions, 2-variable statistics) not normally found on BASIC handhelds. Even its keyboard layout is different: instead of a QWERTY layout, letters of the alphabet are arranged in sequential order.
That said, I kind of like this machine. Maybe it's that "retro" spirit in me, but I find this machine more friendly than later, slimmer Casio models.
That said, I kind of like this machine. Maybe it's that "retro" spirit in me, but I find this machine more friendly than later, slimmer Casio models.
Since this machine has a built-in hyperbolic sine function, it is only appropriate to demonstrate its programming model using an approximation of the logarithm of the Gamma function, developed by Robert H. Windschitl, which uses the hyperbolic sine for a fast and efficient computation:
10 INP "X",X 20 G=1 30 S=SGN X 40 Z=ABS X 50 IF Z>9 THEN 90 60 G=G*Z 70 Z=Z+1 80 GOTO 50 90 G=LN (Z*SQR (Z*HSN (1/Z)+1/810/Z^6))*Z-Z+LN (2*π/Z)/2-LN G 100 IF S>0 THEN 120 110 G=LN (-π/X/SIN (π*X))-G 120 PRT G,EXP G