Texas Instruments TI-82

Date of introduction:  August 1993 Display technology:  LCD dot matrix
New price:   Display size:  8 * 16 characters
Size:  6.8" x 3.1" x 0.85"    
Weight:  5.6 ounces Serial No:  13031722
Batteries:  4*AAA + CR1620 (35mA) Date of manufacture:  mth 01 year 1994 (K)
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  14 Integrated circuits:  CPU: Toshiba T84C00
 ASIC: Toshiba TC14L010
 ROM: LH531©1993
 RAM: SRM2A256
 Display: Toshiba T6A04
Program steps:  28k Bytes Courtesy of:  Joerg Woerner

TI-82_I0194_Back.jpg (258682 Byte)The TI-82 was released in August 1993 after the TI-81 and TI-85 and filled the gap between them neatly. The TI-82 introduced a serial interface to connect either two calculators or one calculator and a personal computer. Later Graphing calculators like the TI-83 got a smoother housing, view the restyled TI-82, too.

TI-82_PCB.jpg (222394 Byte)Dismantling this TI-82 manufactured in January 1994 reveals no surprises. There are a lot of rumors that the TI-82 was based on the TI-85 but we have our doubts: This TI-82 and a TI-81 manufactured in February 1994 use an identical printed circuit board (PCB) with just different RAM and ROM chips populated.

TI-82_I0194_PCBM.jpg (226328 Byte)The hardware consists of a Z80 compatible Toshiba T84C00 CPU, a Toshiba TC14L010 ASIC (1.0 micron C-MOS gate array with 1,000 usable gates) for the glue logic, a Sharp LH531©1993 Mask ROM with 128k Bytes capacity and a Suwa Seikosha SRM2264 Static RAM (SRAM) with 8k Bytes capacity for both user programs and user data. Learn more about the Hardware Architecture of TI’s Graphing Calculators. Don't miss an early TI-82 using a Toshiba TC541001AF OTP ROM (One Time Programmable ROM), instead the Mask ROM. Recently we discovered a TI-82 manufactured in July 1993 with ROM-Version 10.0 burned into a Sharp LH531©1993 ROM!

TI-82_I0194_LCD.jpg (134136 Byte)The driver circuit of the LC-Display was reduced from three Quad-Flat-Pack chips of the original TI-81 to just one bare Toshiba T6A04 chip mounted on a flexible piece of circuit board attached between the display and the main PCB.

A special "teacher version" called TI-82 VSC combines the standard TI-82 features with a port to connect to a ViewScreen panel via a cable. Placing the panel on the overhead projector enlarges the image of the handheld screen so that each student can follow along.

The TI-82 got in 1995 a slightly modified appearance, please focus on the color of the TI-82 designator.

The TI-82 was mentioned in TI's press release dated August 15, 2002 to celebrate the 35th anniversary of its invention of the electronic calculator.


TI-82_I0194_OS.jpg (48992 Byte)15.0

You can check the ROM version of your TI-82 using the following key sequence and reading the number on your screen:


Information provided by and Xavier Andréani.

Exam acceptance:

The TI-82 is permitted (as of September 27, 2007) for use on SAT, ACT, PSAT and AP exams.

The TI-82 is featured in the Texas Instruments Incorporated sales catalog CL-1233 dated 1994.


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© Joerg Woerner, February 4, 2006. No reprints without written permission.