Sharp EL-506R

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
Years of production:   Display type: Numeric display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 5½"×3½"×½" Display size: 10+2 digits and 12 characters
Weight: 4 oz    
    Entry method: Formula entry 
Batteries: 2×"LR44" button cell Advanced functions: Trig Exp Hyp Lreg Intg Ab/c Cplx Cmem BaseN Units Const 
External power: Solar   Memory functions: +/- 
    Programming model: Formula programming 
Precision: 12 digits Program functions:  
Memories: 7 numbers Program display: Formula display  
Program memory: 160 program steps Program editing: Formula entry  
Chipset:   Forensic result: 8.99998762105  

Sharp EL-506RThough it may not appear programmable on first inspection, the EL-506R calculator has two formula memories, capable of storing formulae up to 80 characters in length each.

I received this calculator as a gift recently from Yitzchak Gottlieb; thank you! The calculator suffered from the dreaded "heat seal" problem that affects so many vintage LCD devices, resulting in missing segments and a generally malfunctioning, unreadable display. Fortunately, this time it proved repairable. For now anyway, the calculator is again functional.

The following example demonstrates using the Gamma function the formula programming model of this calculator: