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Texas Instruments TI-68

Date of introduction: | 1989 | Display technology: | LCD dot matrix |

New price: | $65 | Display size: | 12 (8+2) |

Size: | 5.9" x 2.9" x 0.6" 150 x 74 x 15 mm³ |
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Weight: | 3.3 ounces, 93 grams | Serial No: | |

Batteries: | CR2032 | Date of manufacture: | wk 32 year 1990 |

AC-Adapter: | Origin of manufacture: | Italy | |

Precision: | 13 | Integrated circuits: | Toshiba T9948A |

Memories: | 0-55 | ||

Program steps: | 440-0 | Courtesy of: | Roald Hendriks |

Download manual: | (US: 0.3 MByte) |

Marketing
guys called this calculator „Advanced Scientific“, others call it „almost
Programmable“. At first glance the TI-68 seems to be a perfect calculator!
A clear, alphanumeric display with a width of 12 digits, up to 55 memories or
440 programming steps and a calculation precision of 13 digits. Compared with
the TI-60 you
have only the limited programmability of a formula based machine
and the maximum size of a program is only 79 steps. Another drawback is the
overloaded keyboard with a 2^{nd}, 3^{rd} and ALPHA key. On the
pros you get a lot of complex number functions and powerful equation solver.
Nevertheless the TI-68 was a very successful calculator and produced from 1989
until 1999.

To
reduce the manufacturing costs of the calculator some mechanical and electrical
changes were introduced with the TI-68 (1991) model.
At first glance you recognize that the metal bezel of the first edition was
replaced with a plastic bezel.

The
backside of the calculator reveals another methode of cost reduction. The screws
to fix the housing parts together were replaced with a snap-fit construction.

Even
the inside construction of the two calculators is different. Instead the screws
to hold the printed ircuit board (PCB) in the bottom housing we notice the
heat-stamped pins. The calculator circuit itself is identical with both models.

In 1995 part of the production
of the TI-68 was shifted to Malaysia and later to China, compare the differences here.
Roy, a satisfied user of the TI-68 reported recently that he owns a TI-68
manufactured in May 1997 proudly "Made in Italy".

The TI-68 is one of the early calculators using the EOS or
Equation Operating System compared to the original AOS system developed with the
SR-52. The TI-68 lets you enter an expression
into the entry line the same way as you would write it. You can move throught
the entry line to review or edit any part of the expression before evaluating
it. Most of the information about entering and editing applies both to equations
and formulas.

A more powerful calculator was introduced with the Galaxy 67, the TI-60X could be called the "TI-68 light".

As usual within the calculator line of Texas Instruments you'll find a similar Financial calculator. View the BA II PLUS.

If you are interested in the calculating accuracy of scientific calculators don't miss the Calculator forensics.

TI-68? Read more about Chinese Lucky Numbers. Missing your TI-68? Think about the TI-30X Pro MultiView introduced in 2010 and its twin TI-36X Pro.

*AOS™ and EOS™ are trademarks
of Texas Instruments.*

If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, May 2, 2003. No reprints without written permission.