Hewlett-Packard HP-19B

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: 1988-1990 Display type: Graphical display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 6"×8"×½" Display size: 137×32 pixels
Weight: 8 oz    
    Entry method: Algebraic with precedence 
Batteries: 3×"N" alkaline Advanced functions: Trig Exp Lreg Solv Fin Cmem Snd Mtrx 
External power:   Memory functions: +/-/×/÷ 
I/O: IR output     
    Programming model: Formula programming 
Precision: 12 digits Program functions: Jump Cond  
Memories: 6700(0) bytes Program display: Formula display  
Program memory: 6700 bytes Program editing: Formula entry  
Chipset:   Forensic result:  

hp19b.jpg (48198 bytes)The HP-19B is one of the most sophisticated business calculators manufactured by Hewlett-Packard. It is the same folding design as the HP-28S scientific calculator, and shares some of that machine's features, including a relatively large, graphical display. Like its close relative, the HP-17B, the HP-19B also has the "SOLVE" feature as a form of programmability, and includes the conditional function IF and the summation function Σ.

The example I developed for this calculator is an implementation of the Gamma function, extended over the domain of negative numbers with the use of the conditional and summation functions.

G=(-1)^Σ(I:X:0:1:1)×EXP(LN(2.50662827511×(X+Σ(I:X:0:1:1))^6+
   83.8676043424×(X+Σ(I:X:0:1:1))^5+1168.92649479×(X+Σ(I:X:0:1:1))^4+
   8687.24529705×(X+Σ(I:X:0:1:1))^3+36308.2951477×(X+Σ(I:X:0:1:1))^2+
   80916.6278952×(X+Σ(I:X:0:1:1))+75122.633153)-
   Σ(I:0:6:1:LN(X+Σ(J:X:0:1:1)+I))+(X+Σ(I:X:0:1:1)+.5)×
   LN(X+Σ(I:X:0:1:1)+5.5)-X-Σ(I:X:0:1:1)-5.5-Σ(I:X:0:1:LN(-I)))

 

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