PiraComp PR-40
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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PiraComp PR-40
With the PR-40, PiraComp (as I was recently enlightened by a German calculator enthusiast, the name on the front of this machine, DAG Technikum, is that of a German trade union, not the manufacturer) joins the rank of companies producing OEM calculators using the Sharp LI3301A integrated circuit.
Or perhaps more than just the integrated circuit. Unlike other calculators I have with the same chipset, the PR-40 actually looks and feels like a genuine Sharp machine. But is it? The circuit board doesn't reveal the identity of the manufacturer, it only bears an identifier, LC-862C.
The limited programming model of this machine makes it impossible to implement complex algorithms. A sophisticated Gamma function implementation is therefore beyond the machine's capabilities, but Stirling's formula fits easily into the calculator's memory:
x-M 1 M+ ÷ RM ÷ 1 2 + 1 = × RM yx RM ÷ RM ex × ( 2 × π ÷ RM ) √ =