DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-84 Plus T
| Date of introduction: | November 2015 | Display technology: | LCD dot matrix |
| New price: | Display size: | 8 * 16 characters | |
| Size: | 7.5" x 3.3" x
0.85" 190 x 84 x 22 mm3 |
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| Weight: | 7.4 ounces, 208 grams | Serial No: | 1015001729 |
| Batteries: | 4*AAA + SR44 (35mA) | Date of manufacture: | mth 12 year 2015 |
| AC-Adapter: | Origin of manufacture: | Philippines (L) | |
| Precision: | 14 | Integrated circuits: | ASIC: TI REF 84PLCR/TA1 Flash: MX29LV160 Display: Novatek NT7564H |
| Memories: | |||
| Program steps: | 24k Bytes, 1M Bytes Flash ROM | Courtesy of: | Xavier Andréani |
Texas
Instruments introduced in 2015 in the Netherlands with the TI-84 Plus T a
modified version of the TI-84 Plus sold elsewhere
adding a visual feedback LED for Press-to-Test and dropping Assembler support of
the integrated Z80 CPU.
Dismantling
this TI-84 Plus T manufactured in December 2015 by
Kinpo Electronics, Inc. in the
Philippines reveals a
design very similar to the
TI-84 Plus but adding a LED with a small light pipe for the visual Press-to-test feedback - known
from the TI-82 Advanced released in 2015, too for France. We located on the printed circuit board (PCB) of the TI-84
Plus T
three main components:
| • TI REF 84PLCR/TA1: Z80 microprocessor, RAM, USB-Port and supporting logic • Macronix MX29LV800: 1M Bytes Flash ROM • Novatek NT7564H: Single-chip 64*120 pixel display driver |
The
picture on the right gives an enhanced view of the ASIC that clocks the internal Z80
microprocessor with 15 MHz and incorporates the RAM, USB-Port and logic. Learn more about the Hardware Architecture of TI’s Graphing Calculators. Please
notice the smaller package of the new TI REF 84PLCR/TA1 ASIC compared with the
previous TI REF 83PLUSB/TA2 or TI REF 84PLUSB/TA3 found in the TI-84 Plus family
manufactured between 2004 and 2007.
Recently members of the Graphing Calculator Programming community under the lead
of Xavier Andréani made a very interesting discovery:
| • All TI-84 Plus / S.E. with the TA2 or TA3 ASIC have access
to 128k Bytes RAM. • All TI-84 Plus / S.E. with the TA1 ASIC have access to only 48k Bytes RAM using the same assembly commands. |
This
TI-84 Plus T manufactured in December 2015 makes use of
one Macronix Flash ROM with 2M Bytes capacity, please notice that the otherwise
identical TI-82 Advanced uses a Flash ROM with only 1M Bytes capacity.
The
driver circuit of the LC-Display was traditionally manufactured by Toshiba for
Texas Instruments' graphing calculators. This TI-84 Plus T manufactured in
December 2015
shows with the Novatek NT7564H
a one-by-one replacement. It is just a bare chip
mounted on a flexible piece of circuit board attached between the display and
the main PCB.
ROM-Versions:
5.1.0.0029 (actual in May 2020)
You can check the ROM version of your TI-84 Plus T using the following key sequence and reading the number on your screen:
