Casio fx-7000GB

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"×½" Display size: 96×64 pixels
Weight: 6 oz    
    Entry method: Formula entry 
Batteries: 3×"CR-2032" Lithium Advanced functions: Trig Exp Hyp Lreg Grph Cmem BaseN 
External power:   Memory functions:  
I/O:      
    Programming model: Formula programming 
Precision: 13 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 78(26) numbers Program display: Formula display  
Program memory: 422 bytes Program editing: Formula entry  
Chipset:   Forensic result:  

Casio fx-7000GB

fx7000gb.jpg (31323 bytes)The fx-7000GB is another minor variant of Casio's classic graphing calculator, the fx-7000G. Apart from slight differences in housing style, the two models appear to be identical.

The following example is an implementation of the Gamma function using the classic recipe from the book, Numerical Recipes in C: 

"X=":?->X
1->Y
Lbl 1
X>=0=>Goto 2
XY->Y:X+1->X
Goto 1
Lbl 2
e(ln ((1+(76.18009172+9.5E-9)/(X+1)
  -86.50532033/(X+2)+24.01409824/(X+3)
  -1.231739572/(X+4)+1.208650973E-3/(X+5)
  -5.395239384E-6/(X+6))×
  √(2π)/X)+(X+.5)× ln (X+5.5)-X-5.5)/Y