Privileg LC-814PR
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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Privileg LC-814PR
Yet another interesting Privileg programmable calculator, the LC-814PR has the same features and programming model of some other OEM calculators in my possession, such as the Citizen SR-59, the Technico PSR-98, or the Hanimex SPC 1090. Must be a popular chipset; unfortunately, I don't know what chipset it is, since the chip inside this calculator is unmarked. But I suspect that it is made by Toshiba, because its programming model is very similar to chipsets that are known to be Toshiba-made.
The programming model is not terribly efficient, but not completely useless either. The calculator does have conditional branching capability; its biggest drawback is the fact that jumps are limited to within nine steps of the current program location. This is demonstrated by the following program, which computes the logarithm of the Gamma function using Stirling's approximation and a simple iteration for small or negative arguments to ensure 5+ digits of precision:
MS 1 STO 1 9 x<=M 6 RCL 1 × RM = GOTO 2 GOTO 6 GOTO -9 STO 1 1 M+ GOTO -5 MR × ln - MR + ( 2 × π ÷ MR ) √ ln + 1 2 1/x ÷ MR - RCL 1 ln =