Texas Instruments TI-55-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-55-III
Does it look familiar? Other than some minor cosmetic changes, I really see no difference between this calculator and the Texas Instruments TI-55-II. Oh, well, one of them was made in Taiwan, the other in the USA, but then what? (Interestingly, the one made in Taiwan is the one with a better keyboard.)
Functionally, the two calculators are identical. Like the TI-55-II, the TI-55-III is an "almost programmable"; it has capacity to store up to 56 program steps, but no control transfer or conditional instructions are provided. Also, just like on the TI-55-II, loops are not possible even with the RST button, because it stops program execution (in contrast, on the TI-55 or TI-60, RST causes execution to continue at step 00, so simple loops are possible.)
Well, in the absence of anything more sophisticated, here it is again, a simple program that implements Stirling's formula that approximates the extended factorial:
00 61 STO
01 00 0
02 65 ×
03 02 2
04 65 ×
05 91 π
06 95 =
07 13 √
08 65 ×
09 71 RCL
10 00 0
11 45 yx
12 71 RCL
13 00 0
14 55 ÷
15 71 RCL
16 00 0
17 41 INV
18 44 lnx
19 65 ×
20 53 (
21 71 RCL
22 00 0
23 17 1/x
24 55 ÷
25 01 1
26 02 2
27 85 +
28 01 1
29 95 =
30 22 RST