DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Citizen SR-270X
| Date of introduction: | 2008 | Display technology: | LCD dot matrix |
| New price: | Display size: | 3 * 15 characters | |
| Size: | 6.4" x 3.1" x
0.45" 163 x 78 x 12 mm3 |
||
| Weight: | 3.5 ounces, 98 grams | Serial No: | 080602 |
| Batteries: | Solar cells + LR44 | Date of manufacture: | mth 05 year 2008 |
| AC-Adapter: | Origin of manufacture: | China | |
| Precision: | 15 | Integrated circuits: | |
| Memories: | 7 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
Casio
introduced with the fx-115ES already in 2005 an advanced scientific calculator
with a 2-line Natural Textbook Display showing formulas and results exactly as
they appear in the textbook.
Texas Instruments followed mid-2007 with the TI-30XS MultiView and Sharp joined the group with its EL-W531 series introduced late-2007.
Citizen Systems Japan Co., Ltd. introduced in 2008 with this colorful SR-270X a pretty close clone of the Casio fx-300ES but the calculator seems to be available only in the European market. In the United States an identical product is sold by Office Depot as Ativa AT-30SX.
In
addition to the
so called "Math Format" mode the calculator sports a traditional "Linear
Format" mode.
Dismantling the
Citizen SR-270X reveals a pretty common
construction with a single printed circuit board (PCB). The PCB hides the
single-chip calculating circuit under a small protection blob of black epoxy and
drives the graphing display with a heat sealed fine-pitch connector. The prominent
SR100 designation on the main PCB proves that this calculator was manufactured by Kinpo Electronics,
Inc., a famous company located in Taiwan and doing
calculator production for well established companies like Texas Instruments, Hewlett Packard, Casio,
Canon and Citizen.
Please compare the Citizen SR-270X with its competitors Casio
fx-300ES, Sharp
EL-W535B and Texas Instruments
TI-30XS MultiView and understand that the
it is 99% compatible with Casio fx-300ES!The remaining 1% are very ambivalent:
| • The algorithm of the
Citizen SR-270X sport a higher precision and faster execution time. • The menu structure and keyboard functionality is identical but the layout of the keys is disturbing. Please notice for instance the odd grouping of the [sin], [cos] and [tan] keys and the out-of-place [Abs] and [logab] keys. • Both the Citizen SR-270X and Casio fx-300ES sport a dual power system with solar cells and battery, but the Ativa doesn’t turn on without battery, even in bright sunlight! |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 6, 2011. No reprints without written permission.