Casio OH-7700GB

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/log 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: Li-ion rechargeable battery
Lreg: Linear regression (2-var. stats)
mA: Milliamperes of current
Mtrx: Matrix support
NiCd: Nickel-Cadmium recharg. batt.
NiMH: Nickel-metal-hydrite rech. batt.
Prnt: Printer
RTC: Real-time clock
Sdev: Standard deviation (1-var. stats)
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: 1992  Display type: Graphical display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 6½"×3½"×1" Display size: 96×64 pixels
Weight: 6 oz    
    Entry method: Formula entry 
Batteries: 3×"CR-2032" Lithium + 1×"CR-2032" Lithium Advanced functions: Trig Exp Hyp Lreg Grph Ab/c Cmem 
External power:   Memory functions:  
I/O: Serial port     
    Programming model: Formula programming 
Precision: 13 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 4(0) kilobytes Program display: Formula display  
Program memory: 4 kilobytes Program editing: Formula entry  
Chipset:   Forensic result:  

*Overhead display

Casio OH-7700GB

oh7700gb.jpg (29411 bytes)The Casio OH-7700GB is an overhead display calculator that is functionally identical to the OH-7700G with one exception: the OH-7700GB is equipped with a communication port that makes it possible for this calculator to communicate with a desktop PC.

The example program below uses the Lanczos-approximation to accurately compute the value of the logarithm of the Gamma function for all positive and negative arguments where a real result is defined: 

GAMMA
Rad
"X=":?->X
1->S
X<0=>-1->S
X<0=>-X->X
ln (2.506628283501+92.20704845211÷X-
    83.17763708288÷(X+1)+14.80283193078÷(X+2)-
    .2208497079533÷(X+3))+(X-.5)ln (X+3.85)-X-3.85->G
S<0=>ln (-π÷X÷sin πX)-G->G
G