Sharp EL-531
Brief History
Sharp’s first truly cheap, and internally simplified scientific calculator for the educational market (EL-530) was replaced by EL-531 in 1984. This new model has some improvements to achieve lower manufacturing costs: the flexible PCB was replaced by a new, specially-shaped chip made by Toshiba for direct contacts to the display and the keyboard. In addition to the EL-530, it has been capable for calculating statistics. The EL-531 was a great success, so a new model has been released from time to time.
In the US, this model was released as EL-530S. The EL-531 in the US was identical to the EL-531S, which was a redesigned calculator with the same functionality.
| Manufacturer: | Sharp Corporation (Japan) |
| Mfg. date: | 1984-85 |
| Size: | 7×13,7×1,9 cm |
| Weight (ready for operate): | 142 g |
| Type: | scientific |
| Capacity: | 8/5+2 digits (input/display) 11+2 digits (internal precision) |
| Operating logic: | algebraic with precedence |
| CPU: | SC6900 |
| 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) Ffloating-point notation Sciscientific (exponential) notation Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation n!factorial |
| Display: | 8+1 digit LCD |
| Power: | 2×AA-type battery |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.000009718 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688042E-70 |
EL-531
Inside of the EL-531
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