Texas Instruments TI-51-III
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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Texas Instruments TI-51-III
Does this one look familiar? If you cannot discover a difference between this calculator and the TI-55, you're not alone. As far as I can tell, the TI-51-III is identical to the TI-55, the only difference being the model number. Oh, and the fact that the TI-51-III was produced mostly in Europe (presumably for the European market?) whereas the TI-55 is more a North American model.
The TI-51-III, at least inasmuch as its model number is concerned, is the last of a proud line of scientific calculators. After (or along with?) the SR-50 and SR-50A, Texas Instruments also began producing the SR-51, and later, the SR-51A scientific calculators. Then came the SR-51-II and eventually, the TI-51-III, shown on this page. Of all these calculators, only the TI-51-III is programmable; however, it represented a trend, as Texas Instruments added a minimal program capability (no branching, conditionals, or any other advanced program features) to many contemporary scientific models.
As the two calculators are identical, all TI-55 programs run fine on the TI-51-III. This includes programs that utilize the RST instruction, along with the fact that the calculator stops on errors, to implement simple loops. One such program I wrote for the TI-55 calculates the factorial. It is reproduced here for the sake of completeness. After entering the argument, hit RST, then R/S; when the program stops with an error, hit CLR RCL 0 to retrieve the factorial result:
00 51 STO 01 01 1 02 34 1/x 03 61 RCL 04 01 1 05 55 × 06 51 STO 07 00 0 08 43 ( 09 61 RCL 10 01 1 11 65 - 12 01 1 13 44 ) 14 87 RST