PTK-1060
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-1060
A PTK-what? 1060? What kind of a calculator is it? Imagine my surprise when my friend Gabor from Hungary sent an e-mail, attached to which was the photograph of this incredible find: a Hungarian OEM version of the first Soviet programmable calculator, the B3-21, with Western labeling.
The calculator is now in my possession and I can confirm that it is, indeed, a B3-21 in every respect, including the unusual rechargeable battery pack. One curious fact I noticed only after I received an inquiry from Sergei Frolov: all the keys with Western markings are painted, as opposed to the injection-molded language-neutral (or Cyrillic, on the original B3-21) keys.
The machine was in poor condition mechanically, but the 25-year old electronics still work like new, and I was able to repair the damage to the plastic housing. All in all, this machine reinforces the opinion I have of early Soviet calculators: unique, and surprisingly well engineered machines!
Well designed, too. Sure it has some shortcomings and idiosyncrazies (a two-level stack with no automatic stack lifting probably the most annoying among these) but even so, these machines feel eminently useful. The design is of quality, too, in more ways than one: the implementation of non-algebraic functions is accurate, the hardware design is clean, obviously meant for mass production under less than ideal circumstances by an insufficiently skilled labor force.
The bottom line is that after 25 years, these machines still work reliably.
When I first wrote about the B3-21, it seemed to me that its somewhat ineffective programming model makes it impossible to write a useful implementation of my favorite example, the Gamma function. Later, when I got my hands on a B3-21 with a green vacuum fluorescent display, I found out that I was wrong: Stirling's formula can, in fact, be used to write a program that computes the logarithm of the Gamma function 6+ digits of precision for all positive and negative arguments. It is this program that is reproduced below as a programming example for the PTK-1060.
01 06 ^ 02 21 P 2 03 14 1 04 41 P 4 05 16 x-y 10 58 8 11 86 - 12 69 x<0 13 32 32 [F 3] 14 42 F 4 15 26 × 20 41 P 4 21 16 x-y 22 14 1 23 96 + 24 21 P 2 25 06 ^ 30 58 BP 31 06 06 [^] 32 22 F 2 33 06 ^ 34 13 ln 35 26 × 40 86 - 41 31 P 3 42 23 π 43 24 2 44 26 × 45 06 ^ 50 22 F 2 51 36 ÷ 52 65 √ 53 06 ^ 54 42 F 4 55 36 ÷ 60 13 ln 61 06 ^ 62 32 F 3 63 86 - 64 31 P 3 65 34 3 70 04 0 71 45 1/x 72 06 ^ 73 22 F 2 74 55 x^2 75 36 ÷ 80 56 /-/ 81 14 1 82 96 + 83 06 ^ 84 22 F 2 85 36 ÷ 90 14 1 91 24 2 92 36 ÷ 93 06 ^ 94 32 F 3 95 96 + -0 78 C/П