Sharp EL-504
In 1982, a thin variation named EL-513 was introduced, which was a simplified version of the successful calculator with more program and memory capacity named EL-512.
Manufacturer: | Sharp Corporation (Japan) |
Mfg. date: | 1979-82 |
Size: | 7,8×16×2 cm |
Weight (ready for operate): | n.a. |
Type: | programmable scientific |
Capacity: | 10/8+2 digits (input/display) 12+2 digits (internal precision) |
Operating logic: | algebraic with precedence |
CPU: | SC43319A |
Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 15 bracket (with saving the pending operation) 5 memory (with aritmetic) |
Features: | +/-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 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×AA-type battery |
Programming method: | keystroke-programmable |
Program capacity: | 31 keystrokes |
Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.0000050142 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688090276E-70 |
The calculator can handle parentheses up to 16 levels, and the first 4 levels can be checked via the „(„ indicators in the upper line of the display.
To store a number into K1..K4 memory register, press 2ndF STO and the appropriate K button (K1, K2, 2ndF K3 or 2ndF K4. To recall the stored value, press the appropriate K button. The displaying result will be generated by multiplying the K memory contents with the number on the display.
Programming is very simple, but it is not possible to modify or correct a stored program. Entering the programming mode with the 2ndF LRN keys, the previous stored program will be cleared. Every key pressed counts one step in the program. End of the program must be programmed by pressing 2ndF LRN, and while it counts 2 steps, programs only up to 29 keystrokes can be stored.
The stored program — to displaying results — can be paused by pressing 2ndF LOOK. In this case, a „LOOK” indicator appears on the display. To continue running the program, press COMP.
To input values from keyboard at run-time, a (x) command required. The number of variable can be seen between brackets (except the 11. and further variables, which can be used but there isn’t any identifier displayed.