Sharp EL-531D
Brief History
The biggest competitor, Casio continuously dominated the educational market with the fx-82 series of scientific calculators, so Sharp had to develop newer and newer variations of the EL-531 series. The two new member introduced in 1990 had some improvements compared to earlier models. The EL-531D mostly for US market, had smaller form factors due to use of smaller button cells, the EL-531P for the european distribution used AA-sized batteries. Internally, these models were identical: contains new liquid crystal displays with 10+2 digit capacity, and functions which earlier can be available on more expensive calculators, such hyperbolic, combination functions, or engineering notation. The interior construction was changed too: the machines were assembled in Thailand or Taiwan, uses two-sided printed circuit boards with displays connected with ribbon foil cables.
| Manufacturer: | Sharp Corporation (Japan/Taiwan) |
| Mfg. date: | 1990-92 |
| Size: | 7,6×14,2×0,9 cm |
| Weight (ready for operate): | 64 g |
| Type: | scientific |
| Capacity: | 10/10+2 digits (input/display) 12+2 digits (internal precision) |
| Operating logic: | algebraic with precedence |
| CPU: | SC6A50U |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 15 bracket (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (0-9) Sciscientific (exponential) notation Engengineering notation a b/callows entry and display of fractions BSbackspace (right-shift) function Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) hyphyperbolic functions (sinh, cosh, tanh and inverses: ar sinh, ar cosh, ar tanh) DMS-DDconversion of decimal and sexagesimal numbers logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation nCrprobability calculations P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 10+2+2 digit LCD |
| Power: | 2×LR44 button cell |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.0000010289 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688042113E-70 |
EL-531D
Inside of the EL-531D
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