# TI-30

The TI -30 is a popular particularly in school settings calculator, manufactured by Texas Instruments in various versions since 1976 until today.

- 2.1 TI -30X II series
- 2.2 Overview of functions
- 2.3 TI -30X MultiView Series

## Variants

The come on the market in June 1976 Ur -TI -30 quickly became very popular. He mastered the basic arithmetic and scientific basis functions. Compared to contemporary competing models, it emerged from the provisions of point before line calculation and more than the usual one to two clip planes. At that time, the calculator had an LED display with a compared to the later popular LCD displays correspondingly high power consumption and was powered by one 9 -volt block battery. This was enough for about 4 hours of continuous operation. Alternatively, the manufacturer offered to a rechargeable battery pack with charger available as an accessory. The sister model TI -45 had with otherwise identical features a green fluorescent display and multi-colored buttons with inlaid function names, as in the better programmable models of TI. In addition, the TI- 45 was standard with a rechargeable battery and a charger. In 1979, a TI -45 TI -30 cost a DM about 45, about 98 DM; Today, this corresponds to about 50 EUR and 109 EUR.

The chipsets used in the TI -30 and the software used therein varied greatly over the decades. Except for the name of the calculator remained nothing over the years. Came in the original TI- 30 is still the developed directly from Texas Instruments and manufactured chip TMC098x ( TMC0981 ) were used, were in later models, starting the beginning of the 1980s until the mid- 1990s, chips from Toshiba, as the chipset T68xx and T69xx used. Examples are the T6825S in 1982 produced TI -30 SLR or T6974S in 1988 produced calculators. Mid -1990s, then came as the TI- 30Xa chips from Toshiba as the T6M80A used in the models. Texas Instruments introduced the beginning of the 1980s, a development and production of semiconductors for Calculators and bought the chips just yet. Newer TI -30 versions such as those made in 2005, TI -30X IIS models use custom ASICs of Chinese development and manufacturing, which are allocated more no apparent chipset or any chipset family.

### Overview of functions

- 8/5 2- digit display
- Account internally with 11 2 digit number format
- X ², 1 / x, square root, exponential function
- Trigonometric calculations in DEG, RAD, or GRAD
- Decimal and natural logarithms and exponential
- Convert percent automatic
- Constant function for the four basic arithmetic operations and the power function
- A saldierender variable storage
- Input System: Texas Instruments AOS - " Algebraic operation system ".
- Clip function with max. 4 simultaneously open surgery.

## Models

At present (2007) is the computer in the variants TI -30 Xa, TI -30 XII S, TI -30 XII B and TI- 30XS MultiView available with the basic arithmetic operations and many additional features. There is also a variant TI -30 eco RS is equipped with solar panels and is made of recycled plastic. The first powered exclusively with solar panels TI -30 without batteries was the TI -30 SLR from the year 1982.

TI- S 30XII

TI -30 eco RS

TI -30 Galaxy

### TI -30X II series

The TI -30X IIS (S = solar cell operation) and the TI -30X IIB (B = battery operation ), the latest versions of the TI- 30th The LCD used here is composed of two rows and the calculator is capable of storing, viewing and correcting previous entries and statistical data capable.

### Overview of functions

### TI -30X MultiView Series

The TI- 30XS MultiView (S = solar cell operation) and the TI- 30XB MultiView (B = battery), the latest versions of the TI- 30th The LCD used here allows simultaneous viewing of inputs and outputs in up to four lines. It can also calculations in tables, provides significantly clearer calculation methods of statistics and exact arithmetic ( eg partial root extraction or Rational Make the denominator, computing in multiples of pi ).

## Miscalculation

Many TI calculators, including the TI -30, in their software have minor calculation error. This is especially true transcendental functions such as logarithm and the newer TI -30 models, the area functions in certain ranges of values . This is due to the implemented numerical approximation methods, which are not in accordance with carefully designed. Affected are also calculators from other manufacturers, including Casio, Toshiba and Sharp, which use the same routines or faulty chipsets.

A well-known calculation errors of the TI -30 with the name " Logarithm Bug" is known since 1991 and, curiously, in some recent calculator models still available. Moreover, there are, depending on the firmware versions various other erroneous calculations of the power function yx, which is based on the logarithm calculation.

A mistake made by the TI -30X Pro MultiView in solving an equation of the third degree. For example, the computer provided in the solution of an equation with the command poly- solv with a = 2, b = 1, c = 1 and d = 0, the three solutions 0.5, 1 and 2 are right but the solutions 0.5 - 1 and 0 as the absolute member is zero. With similar equations with d = 0, the error could reproduce. With a very latest model of the TI -30X Pro MultiView the calculator gave the correct result, namely 0.5, -1 and 0