Texas Instruments TI-58C
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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-58C
The TI-58C was a TI-58 programmable calculator with continuous memory. Not as flexible perhaps as magnetic card storage, continuous memory solved a major problem nevertheless: what do you do with a calculator with an enormous memory capacity, but with no way to retain programs or data once it is turned off? Entering a 480-step program, after all, may take more time than it takes for the rechargeable battery pack to drain.
The TI-58C became a very popular machine. It was definitely a high-end programmable calculator, with many powerful features, not the least of which was the removable solid state software module. In addition to a dozen or so modules produced by TI, other modules also became available for specialized applications. In some cases, even the calculator itself was heavily customized: keys were removed or creatively relabeled. This is well illustrated by a German product, a customized TI-58C used by agents of the Allianz insurance company.
The example program below computes the logarithm of the Gamma function for positive arguments using the Lanczos-approximationto a precision of 10 or more digits. Registers 1 through 6 must be preloaded with constants before the program can be used.
STO 01 92.20704845211 STO 02 -83.17763708288 STO 03 14.80283193078 STO 04 -0.2208497079533 STO 05 2.506628283501 STO 06 3.85 000 76 LBL 001 11 A 002 42 STO 003 07 07 004 85 + 005 43 RCL 006 06 06 007 75 - 008 24 CE 009 23 ln 010 65 * 011 53 ( 012 43 RCL 013 07 07 014 75 - 015 93 . 016 05 5 017 95 = 018 94 +/- 019 85 + 020 53 ( 021 04 4 022 42 STO 023 00 00 024 43 RCL 025 05 05 026 85 + 027 73 RCL IND 028 00 00 029 55 / 030 53 ( 031 43 RCL 032 07 07 033 85 + 034 43 RCL 035 00 00 036 75 - 037 01 1 038 54 ) 039 97 DSZ 040 00 00 041 00 00 042 26 26 043 54 ) 044 23 ln 045 95 = 046 92 RTN
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