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Texas Instruments TI-82

Date of introduction:	January 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 cosmetic redesign of the TI-82 in 1999.

From a technical point of view is this TI-82 manufactured in 1997 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).

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

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:

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.