ORION TI-84 Plus

Date of introduction:  February 26, 2013
 Available: August 2013
Display technology:  LCD dot matrix
New price:  $599.00 (SRP 2017) Display size:  8 * 16 characters
Size:  9.1" x 3.5" x 1.05"
 232 x 89 x 27 mm3
Weight:  12.0 ounces, 340 grams Serial No:  1482053423
 Module: A0358
Batteries:  4*AAA + SR44 (35mA) Date of manufacture:  mth 02 year 2010 (P)
 Module: mth 08 year 2013
AC-Adapter:   Origin of manufacture:  China (K)
Precision:  14 Integrated circuits:  ASIC: TI-REF 84PLUSB/TA3
 Flash: 29LV800
 Display: Toshiba T6K04
 Module: ARM STM32F405VG,
 STM32F205RE, Cirrus CS43L22
Program steps:  24k Bytes, 480k Bytes Flash-ROM Courtesy of:  Joerg Woerner

Specializing in the development and manufacture of products for people with disabilities, Orbit Research’s mission is to employ cutting-edge technology to bring to the community at affordable prices, products that are essential for an independent and productive lifestyle. Orbit Research and the American Printing House for the Blind (APH) have teamed up to introduce the Orion TI-84 Plus, the world's first fully accessible handheld graphing calculator.

The Orion TI-84 Plus consists of a compact accessory that is attached to the top of the TI-84 Plus and enables a user who is visually impaired to interact with the TI-84 Plus using speech, audio, and haptic (vibration) feedback. All textual and symbolic information on the screen, as well as each key-press is spoken using high-quality synthesized speech. Most importantly, graphs can be explored using either spoken announcements or the SonoGraph™ audio and haptic feedback. The user can also review the contents of the screen at any time, including all text and graphical information, without affecting the calculation. The unit is fully expandable with hardware accessories through a USB port and can also print or emboss graphs when connected to a printer or braille embosser.

Dismantling the ORION TI-84 Plus Module reveals a printed circuit board (PCB) design with only 3 main Integrated Circuits:

STM32F405VG Main CPU
STM32F205RE Secondary CPU
Cirrus CS43L22 Audio DAC

The picture on the right is for the Main CPU of the ORION TI-84 Plus Module, a STM32F405VG single-chip controller centered around an ARM Cortex-M4 core with floating point unit and typically running at 168 MHz. The device integrates both 1,024k Bytes of Flash-ROM and 192k Bytes of RAM.

The next picture on the right is for the Secondary CPU of the ORION TI-84 Plus Module, a STM32F205REsingle-chip controller centered around an ARM Cortex-M3 core, typically running at 120 MHz. The device integrates both 512k Bytes of Flash-ROM and 128k Bytes of RAM.

The picture on the right is the Cirrus CS43L22, a stereo Digital-Analog Converter (DAC) with integrated headphone and Class D speaker amplifiers.  


Modified 2.55MP/ORk (2013)

You can check the ROM version of your TI-84 Plus using the following key sequence and reading the number on your screen: o:p>

[2nd] [MEM] [1]

Information provided by and Xavier Andréani.  

Exam acceptance:

The TI-84 Plus is permitted (as of December 27, 2017) 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, December 28, 2017. No reprints without written permission.