Casio fx-8000G

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: 1986  Display type: Graphical display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 7"×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: Casio 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: 1600 bytes Program editing: Formula entry  
Chipset:   Forensic result: 9.000000590443  

Casio fx-8000G

fx8000g.jpg (33455 bytes)The fx-8000G is a second generation graphing calculator from Casio. It is larger than the fx-7000G, has more memory, and it has a data expansion port, that lets it to be connected to an FA-80 cassette/printer adapter. Yes, this calculator represents a peculiar era: it was the PC era already, and a parallel printer with a Centronics connector was not at all an unusual accessory, but it was an era that preceded the standardizedPC; hence, rather than providing an I/O capability that would let you transfer files between your PC and your calculator, the designers opted for an interface to an external cassette tape recorder for program storage.

The program below demonstrates the programming model of the fx-8000G by implementing the Gamma function using an accurate version of Stirling's approximation:

Ans->X
1->Y
Lbl 1
X>5=>Goto 2
XY->Y
X+1->X
Goto 1
Lbl 2
Xln X-X+ln (2π÷X)÷2+
((((1÷1188÷X÷X-1÷1680)÷X÷X+1÷1260)÷X÷X-1÷360)÷X÷X+1÷12)÷X-ln Y