DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-25X Solar
| Date of introduction: | 1996 | Display technology: | LCD |
| New price: | Display size: | 8 (5 + 2) | |
| Size: | 4.6" x 2.5" x 0.3" | ||
| Weight: | 1.8 ounces | Serial No: | |
| Batteries: | n.a. | Date of manufacture: | mth 10 year 2000 |
| AC-Adapter: | Origin of manufacture: | China | |
| Precision: | 11 | Integrated circuits: | Toshiba T6F27 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
This
TI-25X Solar manufactured in China is identical to the US-built TI-25
STAT. In Europa the calculator was sold as TI-30S
giving some memories to the very first TI-30 with a red LED-display
introduced in 1976.
Like all early TI-30
variants this TI-25X Solar uses an 8-digit display. This is for most calculations convenient but
in scientific notation you'll get only 5 digits of mantissa.
We know the
calculator chip found inside the TI-25X Solar and its sibblings from a lot of
elder calculators, e.g. the TI-31 Solar, the TI-35
SLR and even the TI-30 SLR introduced in 1984.
Dismantling
this TI-25X Solar from a late production run (year 2000) and comparing with an
early TI-30S (year 1997) gave a small surprise: The original Toshiba T6974
single-chip calculator circuit was replaced with a T6F27 chip. This gave the
T6974 a life span of almost 15 years.
The similar TI-25
SOLAR lacked the statistical functions.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.