Texas Instruments TI-82

Date of introduction:  1995 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:  38012312
Batteries:  4*AAA + CR1620 (35mA) Date of manufacture:  mth 12 year 1995
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  14 Integrated circuits:  CPU: Toshiba T84C00
 ASIC: Toshiba TC14L010
 ROM: MX J9533©1995
 RAM: SRM20256
 Display: Toshiba T6A04
Program steps:  28k Bytes Courtesy of:  Joerg Woerner

TI-82_I0596_P1.jpg (341002 Byte)Texas Instruments changed in 1995 the design of the TI-81, TI-82 and TI-85 slightly, please notice the position of the TI-logo and the color of the type designator.

Already one year later, with the introduction of the famous TI-83, the TI-81 was discontinued. Early in 1999 the appearance of the TI-82 was updated again.

TI-82_PCB.jpg (341365 Byte)TI-82_Back.jpg (110514 Byte)From a technical point of view is this TI-82 manufactured in February 1995 is almost identical with the TI-82 introduced in 1993. Recently we dismantled a TI-82 from 1997 - still no major differences.

The only difference we noted is the ROM (Read Only Memory, stores the Operating System of the calculator). Instead of the expected Sharp LH531©94 we discovered a Macronix MX J9533©1995.

TI-82_Memory.jpg (218708 Byte)Even comparing the printed circuit board of the TI-82 with a TI-81 reveals just minor differences:

Component TI-82 (Dec. 1995) TI-81 (Apr. 1996)
(Central Processing Unit)
Toshiba T84C00
(Z80 CPU)
Toshiba T84C00
(Z80 CPU)
(Application Specific IC)
Toshiba TC14L010
Support Logic
Toshiba TC14L010
Support Logic
(Read Only Memory)
Macronix MX J9533©95 
128k Byte ROM
Sharp LH5359©93 
64k Byte ROM
(Random Access Memory)
Epson SRM20256
32k Byte RAM
Epson SRM2264 
8k Byte RAM
Display Driver Toshiba T6A04 Toshiba T6A04

TI-82_LCD.jpg (103841 Byte)The driver circuit of the LC-Display is just one bare chip mounted on a flexible piece of circuit board attached between the display and the main PCB.

A serial port of the calculators allows the connection to the Calculator-Based Laboratory system CBL, its successor CBL 2, the Calculator-Based Ranger CBR and its successor CBR 2.

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.


TI-82_I0497R_OS.jpg (40388 Byte)19.0

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.


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If you have additions to the above article please email:

© Joerg Woerner, February 8, 2008. No reprints without written permission.