Casio fx-202P
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-202P
When I acquired my Casio fx-201P, I was under the impression that it was Casio's only early VFD programmable calculator. I've since been proven wrong more than once: it appears that at the time, Casio had an entire family of machines based on this model. One member of this family is the fx-202P, which has the same capabilities as the fx-201P, with one rather important difference: it uses CMOS memory that has a battery backup. In other words, along with HP, Texas Instruments, and Sharp, Casio also had an entry in the market of "continuous memory" programmable calculators in the mid-1970s.
Today is a bright, early spring day made brighter by the fact that the mailman brought me a wonderful gift: a real live working fx-202P! Thank you, Hugh! These rather large-ish scientific calculators somehow manage to convey a sense of magic that is so often missing from later models, no matter how capable.
The fx-201P/202P family uses a rather unusual, programming language like programming model. Highly unusual is the fact that programs are not like interactive keystroke sequences; for instance, if you wish to add 1 to memory register 0, the program would read 0 = 0 + K 1, much more like a procedural language than a keystroke macro.
Back when I first acquired an fx-201P, I explored its capabilities by writing yet another program for the Gamma function, my favorite programming example. Presented here in short form, it neatly demonstrates the calculator's capabilities:
ENT 1 : 2 = K 1 : ST# 3 : IF 1 = K 9 : 1 : 2 : 2 : ST# 1 : 2 = 2 × 1 : 1 = 1 + K 1 : GOTO 3 : ST# 2 : 0 = K 1 ÷ K 105 ÷ 1 ÷ 1 : 0 = K 1 ÷ K 30 - 0 ÷ 1 ÷ 1 : 0 = K 1 - 0 ÷ 1 ÷ K 12 : 0 = 1 × ln - 1 + 0 - 2 ln: 2 = K 6.2831853 ÷ 1 : 0 = 2 √ ln + 0: ANS 0 :