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
117 x 64 x 10 mm3
|Weight:||1.8 ounces, 50 grams||Serial No:|
|Batteries:||n.a.||Date of manufacture:||mth 03 year 1997|
|AC-Adapter:||Origin of manufacture:||China (N)|
|Precision:||11||Integrated circuits:||Toshiba T6974|
|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.
Dismantling this TI-25X Solar manufactured in March 1997 by Nam Tai Electronics, Inc. in China reveals a printed circuit board (PCB) with a TI-30S designator and sporting a Toshiba T6974 single-chip calculator circuit. We know this calculator chip from some older calculators, e.g. the TI-31 Solar, the TI-35 SLR and even the TI-30 SLR introduced in 1984.
Dismantling a TI-25 STAT from a late production run (year 2000) revealed 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.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.