DATAMATH CALCULATOR MUSEUM
|Date of introduction:||2008||Display technology:||LCD dot matrix|
|New price:||Display size:||3 * 15 characters|
|Size:|| 6.4" x 3.1" x
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|
|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.
addition to the
so called "Math Format" mode the calculator sports a traditional "Linear
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!
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© Joerg Woerner, March 6, 2011. No reprints without written permission.