Texas Instruments TI-82

Date of introduction:  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 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 with 128k Bytes capacity and a Suwa Seikosha SRM2264 RAM with 8k Byte capacity for both user programs and user data. 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.