Casio FX-602P
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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Despite the prodigious number of calculator models Casio produced over the years, few are inspiring. This early LCD model, the FX-602P, is, however, an exception. A very well designed machine with considerable memory capacity, the FX-602P has a good programming model, several program control instructions, even something that's an absolute rarity on Casio calculators: indirect memory access.
One thing that this machine curiously lacks is display contrast control. (Unless there's some obscure key combination for it, described in a manual I do not have.) It took some time until I found an internal potentiometer that helped me turn down the display contrast; initially, the display was so dark, it was nearly unreadable.
Needless to say, as soon as I had a readable display, I began playing with my new calculator; and my playing, as usual, included writing another program for the Gamma function. This 82-step program neatly demonstrates the calculator's programming model, as it calculates the natural logarithm of the Gamma function for all real arguments to 10+ digits of precision:
001 Min00 002 1 003 Min01 004 5 005 MinF 006 LBL1 007 MR00 008 x>=F 009 GOTO2 010 MR00 011 × 012 MR01 013 = 014 Min01 015 1 016 M+00 017 GOTO1 018 LBL2 019 MR00 020 × 021 ln 022 - 023 MR00 024 + 025 ( 026 2 027 × 028 π 029 ÷ 030 MR00 031 ) 032 √ 033 ln 034 + 035 ( 036 ( 037 ( 038 ( 039 9 040 9 041 1/x 042 ÷ 043 MR00 044 x2 045 - 046 1 047 4 048 0 049 1/x 050 ) 051 ÷ 052 MR00 053 x2 054 + 055 1 056 0 057 5 058 1/x 059 ) 060 ÷ 061 MR00 062 x2 063 - 064 3 065 0 066 1/x 067 ) 068 ÷ 069 MR00 070 x2 071 + 072 1 073 ) 074 ÷ 075 1 076 2 077 ÷ 078 MR00 079 - 080 MR01 081 ln 082 =