Date of introduction:  2007 Display technology:  LCD dot matrix
New price:   Display size:  4 * 16 characters
Size:  6.3" x 3.1" x 0.55"
 160 x 78 x 14 mm3
Weight:  3.5 ounces, 100 grams Serial No:  7D017
Batteries:  LR44 Date of manufacture:  
AC-Adapter:   Origin of manufacture:  China
Precision:  14 Integrated circuits:  
Memories:  9    
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.

In June 2008 we know nine Sharp calculators sporting the WriteView Display:

Type Power Supply Functions Comments
EL-W531B, EL-W531H, EL-W531HA AAA battery 335   
EL-W531, EL-W535 LR44 335  
EL-W531G Solar + LR44 335  
EL-W506. EL-W516,
Solar + LR44 556 52 constants, 44 conversions,
complex numbers, equation solver, matrix operations

In addition to this so called "WriteView" mode the calculator sports a traditional "Linear" mode.

Dismantling the Sharp EL-W535B 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. 

Please compare the Sharp EL-535 with its competitors Casio fx-300ES and Texas Instruments TI-30XS MultiView.


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If you have additions to the above article please email:

Joerg Woerner, June 8, 2008. No reprints without written permission.