EL-506P
Brief History
As a copy of Sharp’s highly successful EL-506H (1981) and its successor, the EL-506P (1984), a wide variety of clones and fakes have been made since the mid-1980s. What they have in common is that a functional copy of the EL-506P — which contains Samsung’s KS6041 “replacement circuit” of the original Sharp machine’s SC6992 IC — is placed in a housing very similar to the original EL-506H. One version of the clones is Yk587, of which an unbranded version is shown here. Its quality and operability fall short of the requirements: the metal plate that electrically connects the two button cells, which also presses them down, is held by a miniature screw that can no longer hold the batteries even after the second battery replacement. The conductive layer on the rubber keyboard wears out quickly, making it increasingly difficult to operate the keys.
You can read more about clones in this article.
| Manufacturer: | n.a. (ismeretlen) |
| Mfg. date: | n.a. |
| Size: | 6,9×12,7×1 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 10/8+2 digits (input/display) 12+2 digits (internal precision) |
| Operating logic: | algebraic with precedence |
| CPU: | KS6041 |
| 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. 60.0000010291 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688042113E-70 |
The calculator
Inside the calculator 1.
Keyboard and display of the machine
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