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Texas Instruments TI-73 Explorer

Date of introduction:  2003 Display technology:  LCD dot matrix
New price:  $69.99 (SRP 2008) Display size:  8 * 16 characters
Size:  7.2" x 3.2" x 0.80"
 182 x 81 x 20 mm3
   
Weight:  6.4 ounces, 182 grams Serial No:  2242007236
Batteries:  4*AAA + CR1620 (35mA) Date of manufacture:  mth 04 year 2004 (D)
AC-Adapter:   Origin of manufacture:  China (S)
Precision:  14 Integrated circuits:  CPU: Zilog Z84C00
 ASIC: TI-REF 9815455
 Flash: F29LV400
 RAM: HY62WT081
 Display: Toshiba T6A04A
Memories:      
Program steps:  25k Bytes, 128k Bytes Flash-ROM Courtesy of:  Joerg Woerner

TI-73_Explorer_1.jpg (96775 Byte)The TI-73 Explorer followed the TI-73 and serves as a bridge between the TI-15 Explorer and the TI-83 Plus.

TI-73_Explorer_PCB.jpg (303731 Byte)Dismantling the TI-73 Explorer reveals no surprises, the printed circuit boards (PCBs) are still identical with the TI-83 Plus and based on 5 main Integrated Circuits:

Zilog Z84C00 microprocessor
TI REF 9815455 ASIC
Fujitsu F29LV400 512k Byte Flash-ROM
Hyundai HY62WT081 32k Byte RAM
Toshiba T6A04A: Single-chip 64*120 pixel display driver

TI-73_Explorer_ASIC.jpg (82187 Byte)The picture on the right gives an enhanced view of the ASIC "TI-REF 9815455"  integrating some support logic. 

TI-73_Explorer_LC.jpg (104841 Byte)A component not easily detected on the printed circuit board (PCB) of the TI-73 Explorer is the driver circuit of the LC-Display. It is just a 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.

Don't muss the colorful slide cases developed for the TI-83 Plus, they fit on the TI-73 Explorer, too.

Texas Instruments reduced in 2006 the chip count of both the TI-73 Explorer and its technical twin TI-83 Plus with the integration of the Z84C00 microprocessor, 32k Byte RAM and TI REF 9815455 ASIC into a single-chip solution. In 2009 the grandfather of all Flash-ROM based calculators, the TI-73, morphed into the skin of the TI-84 Plus. Don't miss the new TI-73 Explorer.

Stokes Publishing Company, Inc. based in Sunnyvale, California sold a companion for the teacher, view the wonderful TI-73 Explorer.

Explorer™ is a trademark of Texas Instruments.


ROM-Versions:

1.60 (December 16, 2001)
1.80
1.85

1.90 (February 6, 2006)
1.91 (March 20, 2008, actual in February 2009)

You can check the ROM version of your TI-73 Explorer using the following key sequence and reading the number on your screen:

[2nd] [MEM] [1]

Information provided by ticalc.org and Xavier Andréani.

Exam acceptance:

The TI-73 Explorer is permitted (as of September 27, 2007) for use on SAT, ACT, PSAT and AP exams but is not recommended for the AP exam.

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

© Joerg Woerner, November 11, 2004. No reprints without written permission.