Casio fx-7000G

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: 1985  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:  
    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:  

fx7000g.jpg (32313 bytes)The fx-7000G is a notable calculator: along with the fx-6000G, this was the first graphing calculator that appeared on the market in the mid-1980s.

The machine's roots are unmistakable. Whereas later graphing calculator models have many computer-like features, the fx-7000G retains many of the characteristics of earlier, non-graphing calculators. The use of a MODE key for switching to program mode, for instance, is common to many Casio pocket calculators, whereas the use of ten program "slots" is familiar to anyone who used a Casio BASIC handheld computer.

By far the most significant limitation of this calculator is its small memory: less than half a kilobyte available for programs and data. That said, this does not make the machine as limited as one might believe, thanks to efficient (tokenized) program storage.

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

Lbl 1
X>=0=>Goto 2
Goto 1
Lbl 2
e(ln ((1+(76.18009172+9.5E-9)/(X+1)
  √(π×2)/X)+(X+.5)× ln (X+5.5)-X-5.5)/Y