Panasonic JE-554U
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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Panasonic JE-554U
This Panasonic calculator has a different keyboard layout, but it is functionally identical to the Canon F-802P. Both calculators, and several other functionally identical models from various manufacturers appear to be based on the same Toshiba programmable calculator integrated circuit.
This is a fairly no-compromise machine with a comprehensive set of scientific and statistical functions, and even a built in constants library and unit conversions. My biggest gripe is that it provides no mechanism for reviewing or editing programs: program code is entered blindly. This makes its otherwise powerful programming model (128 partially merged steps, conditional jump capability) unnecessarily difficult to utilize fully.
Not uncommon among "programming in the blind" models, this machine even has that atrocious "feature" that the display register is cleared whenever you switch to program entry mode. If you are trying to enter an algorithm that yields an error for a null argument, well... good luck! (Fortunately, on the JE-554U it is possible to hit the CE/C key, which will not register as a program step, but clears the error condition and lets you continue program entry.)
My other gripe? Well... this Panasonic machine just feels wrong in one's hands. It's needlessly large: it's also very thing, giving an impression of fragility.
The following programming example demonstrates the programming model of the JE-554E through an implementation of the logarithm of the Gamma function based on Stirling's formula:
STO 0 1 STO 1 5 x<=M 8 RCL 0 STO × 1 1 M+ GOTO -9 1 1 8 8 1/x ÷ RCL 0 x2 - 1 6 8 0 1/x = ÷ RCL 0 x2 + 1 2 6 0 1/x = ÷ RCL 0 x2 - 3 6 0 1/x = ÷ RCL 0 x2 + 1 2 1/x = ÷ RCL 0 + RCL 0 * RCL 0 ln - RCL 0 + ( 2 × π ÷ RCL 0 ) ln ÷ 2 - RCL 1 ln =