Prinztronic Programmable Scientific
| 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 |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Prinztronic Programmable Scientific
When I first heard about this programmable calculator released under the Prinztronic brand, I had no idea what to expect. However, when the calculator finally arrived it was immediately familiar: it was none other but the Qualitron Model-1421 in OEM disguise.
Which, in turn, is really a repackaged National Semiconductor calculator: the Novus 4515 (Mathematician PR) to be precise. A curious early scientific model with some severe limitations, most notably among them the lack of a scientific (exponential) display mode!
The machine's programming model is well illustrated by the Gamma function program I once wrote for the Model-1421, a program that uses Stirling's formula to compute a very accurate approximation for positive arguments:
ENTER 5 + MS ln MR × MR - π 2 × MR ÷ ln 2 ÷ + 1 2 1/x MR ÷ + 7 2 1/x 5 ÷ MR ÷ MR ÷ MR ÷ - 2 5 2 1/x 5 ÷ MR ÷ MR ÷ MR ÷ MR ÷ MR ÷ + 1 M- C MR 1 M- C MR × 1 M- C MR × 1 M- C MR × 1 M- C MR × ln -
