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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:  54728770
Batteries:  4*AAA + CR1620 (35mA) Date of manufacture:  mth 04 year 1997
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  14 Integrated circuits:  CPU: Toshiba T84C00
 ASIC: Toshiba TC14L010
 ROM: LH531©1995
 RAM: W54257S
 Display: Toshiba T6A04
Memories:      
Program steps:  28k Bytes Courtesy of:  Joerg Woerner

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. The featured calculator was manufactured in April 1997, two years before a cosmetical redesign of the TI-82 in 1999.

TI-82_I0497R_PCB.jpg (371060 Byte)From a technical point of view is this TI-82 manufactured in 1997 is almost identical with the TI-82 introduced in 1993.

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 (ROM-Version 18.0) we discovered a LH531©1995 (ROM-Version 19.0).

TI-82_I0497R_PCBM.jpg (225231 Byte)Even comparing the printed circuit board of the TI-82 with a TI-81 reveals just minor differences:

Component TI-82 (Apr. 1997) TI-81 (Apr. 1996)
CPU
(Central Processing Unit)
Toshiba T84C00
(Z80 CPU)
Toshiba T84C00
(Z80 CPU)
ASIC
(Application Specific IC)
Toshiba TC14L010
Support Logic
Toshiba TC14L010
Support Logic
ROM
(Read Only Memory)
LH531©95 
128 Byte ROM
Sharp LH5359©93 
64k Byte ROM
RAM
(Random Access Memory)
Winbond W54257S
32k Byte RAM
Epson SRM2264 
8k Byte RAM
Display Driver Toshiba T6A04 Toshiba T6A04

TI-82_I0497R_PCBD.jpg (136565 Byte)The driver circuit of the LC-Display is just one bare Toshiba T6A04 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.

ROM-Versions:

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:

[MODE] [ALPHA] [S]

Information provided by ticalc.org and Xavier Andréani.

Exam acceptance:

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

 

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

© Joerg Woerner, February 18, 2009. No reprints without written permission.