DATAMATH CALCULATOR MUSEUM
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
Display: Toshiba T6A04
|Program steps:||28k Bytes||Courtesy of:||Joerg Woerner|
TI-82 was released after the TI-81 and TI-85
and filles 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.
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.
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. Recebtly we discovered a TI-82 manufactured in July 1993 with ROM-Verison 10.0 burned into a Sharp LH531©1993 ROM!
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.
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.
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: firstname.lastname@example.org.
© Joerg Woerner, February 4, 2006. No reprints without written permission.