TI-30

TI-30 in its original form with red seven-segment LED display (1979)

TI-45 with identical functionality (1980)

ASIC in TI-30X IIS (year 2005)

The TI-30 is an especially in school common area calculator from Texas Instruments and is still produced today in different variations. The original TI-30 appeared in June 1976. In addition to the basic arithmetic operations, it mastered basic scientific functions and quickly became very popular. Compared to contemporary competing models, it stood out by paying attention to dot-to-dot and more bracketed levels than the usual one or two.

A TI-30 cost around 45 DM in 1979  , which corresponds to around 52 euros in today's purchasing power ; at the same time, the functionally identical sister model TI-45 with a higher-quality advertisement , which was only released in 1978, cost around 100 DM. Today 116 euros.

Furnishing

The pocket calculator originally had an LED display, which consumed more power than the liquid crystal display (LCD or LC display) that would later be used and, with its 9-volt block battery, allowed around four hours of continuous operation. The manufacturer optionally offered a rechargeable battery pack with a charger as an accessory.

For the European market alone, the sister model TI-33 was produced from 1977 with three storage spaces instead of just one and sold with a rechargeable battery instead of a battery. Because of the memory keys , he was missing the percent key.

In 1982, the TI-30 SLR was the first battery -free TI-30 operated only with solar cells.

The sister model TI-45 had an otherwise identical range of functions, a green fluorescent display and, like the higher-quality programmable TI models, multi-colored buttons with inserted function names. In addition, the TI-45 was delivered with a battery and charger as standard.

The chipsets and software used in the TI-30 have varied greatly over the decades. Except for the name of the pocket calculator, nothing has survived over the years. The TMC0981 chip, developed and manufactured by Texas Instruments itself, was used in the original TI-30 and the TMC0984 in the European TI33.

At the beginning of the 1980s, Texas Instruments stopped developing and manufacturing semiconductors for pocket calculators and continued to use chipsets from the T68xx and T69xx series from Toshiba until the mid-1990s , for example the T6825S in the solar-powered TI-30 SLR or from 1982 in the T6974S pocket calculators produced in 1988. After that, other Toshiba chips like the T6M80A were used in models like the TI-30Xa .

Newer models also use application specific integrated circuits (ASIC).

There was also the TI-30 ECO RS variant with solar cells and a housing made of recycled plastic.

Original functions

• 8/5 + 2-digit display
• Internal invoice with 11 + 2-digit number format
• Reciprocal (1 / x), square number (x²) and root (√)
• Trigonometric functions ( sine, cosine , tangent ) in degrees ( D EG), radians ( R AD) or gons ( G RAD) including arc functions ( arcsin, arccos , arctan )
• Tens - ( ) and natural ( ) logarithm ${\displaystyle \log }$ ${\displaystyle \ln }$
• Power function ${\displaystyle y^{x}}$
• Circle number key ( ) ${\displaystyle \pi \approx 3{,}141592653589793\ldots }$
• Key for percentage calculation
• Automatic constants for the four basic arithmetic operations and the power function
• A data memory with a balance key
• AOS input (Texas Instruments Algebraic Operation System ) with consideration of the operator precedence , in addition:
• Bracket keys for max. 4 operations open at the same time

• 

  TI-30Xa Solar

• 

  TI-30XII S.

• 

  TI-30 eco RS

• 

  TI-30 Galaxy

• 

  TI-30 LCD

Newer models

Since the turn of the millennium, the series of the TI-30 has been continued with further developed, newer models that cost less than 30 euros when they were launched and thus significantly less than the original models.

TI-30X II series

From June 1999 the newer versions TI-30X IIB (battery operation) and the TI-30X IIS (solar cell operation) were sold. Your LC displays consist of two lines. The models have five memory locations and allow you to save, display and correct previous entries and statistical data sets.

Function overview

• 11/10 + 2-digit display
• Two-dimensional statistics
• Equation Recall - function to view and correct previous entries and statistical data
• Scroll and edit the display in four directions
• Fractional arithmetic and fraction conversion
• Trigonometric calculations in DEG, RAD, or GRAD
• Polar and rectangular coordinates
• Display of angles in degrees, minutes, seconds
• 5 variable memory
• Term entry in normal mathematical notation

TI-30X MultiView series

→ Main article : TI-30X Plus MultiView

The TI-30X Pro MultiView introduced the latest series of the TI-30 in May 2010 and was powered by a solar cell and CR2032 battery . It was followed in April 2015 by the TI-30X Plus MultiView, which, like its predecessor, is equipped with eight memory locations. Their LC displays allow the simultaneous viewing of inputs and outputs in up to four lines. They also allow calculations in tables, provide clear calculation options for statistics and exact arithmetic (e.g. partial root extraction or rationalization of the denominator, calculation in multiples of the circle number Pi).

Bug

Demonstration of the so-called "logarithm bug" - the value of ln (1.0000001) was calculated in each case

As in many TI pocket calculators, the software of the TI-30 also has small program errors that mainly affect transcendent functions such as the logarithm or the area functions in certain value ranges of newer TI-30 models. The cause lies in incorrectly implemented numerical approximation methods and also affects pocket calculators from other manufacturers with the same routines or chipsets, including Casio , Toshiba or Sharp .

A bug in the TI-30, known as the "logarithm bug" since 1991, was still present in some later models. In addition, depending on the firmware version , there are incorrect calculations for the power function y ^x , which are based on the logarithm calculation .

With the TI-45, entering 0 INV TANdid not provide the mathematically unambiguous solution , but got into an endless loop that could only be ended by interrupting the power supply. ${\textstyle \arctan 0=0}$

Web links

Commons : TI-30  - collection of pictures, videos and audio files

• Texas Instruments TI-30 in the Datamath Calculator Museum ( English )
• Scientific school calculators - Germany at Texas Instruments

Individual evidence

1. ↑ ^{a b} Texas Instruments TI-30. datamath.org (Datamath Calculator Museum), accessed May 14, 2019 .  
2. ↑ Texas Instruments TI-45. datamath.org (Datamath Calculator Museum), accessed May 18, 2019 .  
3. ↑ The inflated figures are taken from the template: Inflation and refer to last January.
4. ↑ ^{a b} Texas Instruments TI-33. datamath.org (Datamath Calculator Museum), accessed May 14, 2019 .  
5. ↑ Texas Instruments TI-30 SLR. datamath.org (Datamath Calculator Museum), accessed May 14, 2019 .  
6. ↑ ^{a b} Texas Instruments TI-30X IIB. datamath.org (Datamath Calculator Museum), accessed May 15, 2019 .  
7. ↑ ^{a b} Texas Instruments TI-30X IIS. datamath.org (Datamath Calculator Museum), accessed May 15, 2019 .  
8. ↑ ^{a b} Texas Instruments TI-30X Pro MultiView. datamath.org (Datamath Calculator Museum), accessed May 15, 2019 .  
9. ↑ ^{a b} Texas Instruments TI-30X Plus MultiView. datamath.org (Datamath Calculator Museum), accessed May 15, 2019 .  
10. ↑ Logarithm Bug Specific detailed information and error tables for the "Logarithm Bug". (in English)