PTK-1023
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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Híradástechnika PTK-1023
A couple of years ago, I was talking to a friend of mine about my growing calculator collection, and in particular, about those OEM calculator models that were produced in Hungary around the time when we were in high school. He surprised me greatly when he mentioned a model I never heard of before; a PTK calculator that was, according to his recollection, an OEM version of a National Semiconductor (Novus) programmable.
Eventually, I was able to get more information about this mysterious machine and now, I finally have one in my possession. And a Novus machine it is: none other but the Scientist PR, one of the early Novus programmables. It is in reasonably good shape, too, working fine; sadly, most of the instruction panel on the black is no longer legible, as the printing wore off over the years.
One mystery remains. The model numbers of other PTK calculators are derived from the number of program steps stored by the calculator. The PTK-1050 has 50, the PTK-1072 has 72, and the PTK-1096 has 960 program steps. But it's hard to see how the model number of the PTK-1023 relates to its 102 step program capacity.
Like other early Novus programmables, the PTK-1023 offers no conditional or jump instructions, nor is there any way to review or correct a program. Nevertheless, a generous 100 program steps combined with the RPN programming model make this a capable calculator. Its main shortcoming is the great inaccuracy of the built-in scientific functions, especially its trigonometric functions.
The programming model is well demonstrated by the following implementation of the Gamma function, which remains my preferred programming example. Using barely more than half the program capacity of the calculator, this program computes the logarithm of the Gamma function for any argument greater than 2 to the maximum accuracy possible on this machine.
MS EN ln × MR - 2 π × MR ÷ √ ln + MR MR × 1/x 9 9 ÷ 1 4 0 1/x - MR ÷ MR ÷ 1 0 5 1/x + MR ÷ MR ÷ 3 0 1/x - MR ÷ MR ÷ 1 + 1 2 ÷ MR ÷ +