Sharp IQ-7000

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: Graphical display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 6¼"×4"×1" Display size: 96×64 pixels
Weight: 10 oz    
    Entry method: BASIC expressions 
Batteries: 2×"CR-2032" Lithium Advanced functions: Trig Exp Lreg Cmem RTC Snd 
External power:   Memory functions:  
I/O: Serial port, Parallel port, Module port     
    Programming model: BASIC 
Precision: 14 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 16(0) kilobytes Program display: Text display  
Program memory: 16 kilobytes Program editing: Text editor  
Chipset:   Forensic result:  

iq7000.jpg (50323 bytes)This Sharp IQ-7000 wouldn't qualify as a programmable calculator were it not for its modular design, and the existence of a BASIC card that turns this high-end organizer into a full-function BASIC programmable computer.

The programming model of this BASIC interpreter is similar to that found on many other BASIC-programmable Sharp calculators. Curiously, the BASIC card also contains a built-in "AER" application, which emulates the "Algebraic Expression Reserve" formula programming method found on other Sharp handheld programmables.

The programming example below computes the logarithm of the Gamma function for any real argument. This variation makes use the so-called reflection formula that provides a simple relationship between the Gamma function values for +x and −x.

40:IF X>0 THEN 80
80:IF X>5 THEN 120
110:GOTO 80
120:G=S*(X*LN X-X+LN(SQRT(2*PI/X)*G)+((((1/1188/X/X-1/1680)/X/X+1/1260)/X/X-1/360)/X/X+1/12)/X)