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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:  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
Memories:      
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)
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)
Macronix MX J9533©95 
128k Byte ROM
Sharp LH5359©93 
64k Byte ROM
RAM
(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.

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.

 

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

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