Sharp EL-5050
Datasheet legend
Ab/c:
Fractions calculation
AC: Alternating current BaseN: Number base calculations Card: Magnetic card storage Cmem: Continuous memory Cond: Conditional execution Const: Scientific constants Cplx: Complex number arithmetic DC: Direct current Eqlib: Equation library Exp: Exponential/logarithmic functions Fin: Financial functions Grph: Graphing capability Hyp: Hyperbolic functions Ind: Indirect addressing Intg: Numerical integration Jump: Unconditional jump (GOTO) Lbl: Program labels LCD: Liquid Crystal Display LED: Light-Emitting Diode Li-ion: Lithium-ion rechargeable battery Lreg: Linear regression (2-variable statistics) mA: Milliamperes of current Mtrx: Matrix support NiCd: Nickel-Cadmium rechargeable battery NiMH: Nickel-metal-hydrite rechargeable battery Prnt: Printer RTC: Real-time clock Sdev: Standard deviation (1-variable statistics) Solv: Equation solver Subr: Subroutine call capability Symb: Symbolic computing Tape: Magnetic tape storage Trig: Trigonometric functions Units: Unit conversions VAC: Volts AC VDC: Volts DC |
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Sharp EL-5050
This unassuming little calculator turned out to be a far more powerful beast than its appearance would suggest. A 1430-step program memory, conditional execution and loops, a simple subroutine functionality, and 26 named variables make a respectable machine.
Programs are basically algebraic formulae, with a few special operators that allow repeated or conditional execution. A program line is limited to 160 characters, but with up to nine "subroutine" lines, it is possible to use all of program memory in a single program. This allows for fairly complex solutions to be programmed into this calculator.
One demonstration is a program that computes the natural logarithm of the Gamma function, implemented here using Stirling's formula. A simple loop extends the domain of this implementation to all negative numbers (except for negative integers of course) yielding a full 10 digits of precision for most arguments. Newlines have been inserted here for clarity, but they don't need to be keyed in when entering this program into the calculator.
f(X)=1⇒G \(\llcorner\rightarrow\)X>5•N→[ GX⇒G X+1⇒X\(\leftarrow\urcorner\) ] XLN X-X+LN √(2π÷X)-LN G+ ((((1÷1188÷X2-1÷1680)÷X2+1÷1260)÷X2-1÷360)÷X2+1÷12)÷X