Sharp EL-506P
Brief History
In 1984, three year after introducing the EL-506H in the family of EL-506 dated from 1979, Sharp started manufacturing the new EL-506P model. It was able to convert angles given in different units, numbers between binary, octal, decimal and hexadecimal notations, and handle complex numbers. In the early series, it contains a new flexible printed circuit board directly connected to the display and keyboard, and a year later it was replaced by a special packaged IC manufactured by Toshiba, which eliminated the need for a printed circuit board.
With the replicas of the chip used in EL-506P, the first „clones” was built in similar housing as used in EL-506H, at various factories in Hong Kong, Taiwan and China. Later, with similar appearance and same model number, a simple programmable calculators based on a genuine Sharp chip — which was made for Sanyo — completed. The story and types of clones and fakes will be discussed in a separate article.
| Manufacturer: | Sharp Corporation (Japan) |
| Mfg. date: | 1984 |
| Size: | 6,9×12,7×0,9 cm |
| Weight (ready for operate): | 74 g |
| Type: | scientific |
| Capacity: | 10/8+2 digits (input/display) 12+2 digits (internal precision) |
| Operating logic: | algebraic with precedence |
| CPU: | Sharp LI3305 |
| 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 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 P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 11+1 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. 60.0000071862 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688090138E-70 |
First version of EL-506P
Inside of the EL-506P (version 1)
Display and keyboard of the EL-506P (version 1)
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