The Museum of HP Calculators

MoHPC HP-41C Software Library

This library contains copyrighted programs that are used here by permission. These programs are grouped by the calculator for which they are written but it is fairly easy to port a program from one RPN calculator to another.

Additional programs may also be found in the main Software Library and the Articles Forum. Additional HP-41, HP-71 and HP-75 files in LIF format (and LIF Utilities) may found at the Museum FTP site.

Instructions and Programming Information
- XROM Numbers (How to work with programs that contain XROM ##,##.)
- Documentation Information (for those programs with no online documentation)
- How to get these programs to your Calculator (via HP-IL, disk, wand, and fingers)
- HP-41C Programming Information
- HP-41C Synthetic Programming
User-submitted Programs (Not from HP pacs or solution books)
- Utilities
- Astronomy
- Base Conversions
- Math / Enginering
  - Gamma , Digamma and Polygamma & Beta Functions (Updated)
  - Bessel Functions
  - Kummer's ( or Confluent Hypergeometric ) Functions M(a;b;x)
  - Parabolic Cylinder Functions U(a;x) V(a;x) W(a;x)
  - Hypergeometric Functions F(a;b;c;x)
  - Asscociated Legendre Functions
  - Orthogonal Polynomials Includes:
    - Legendre Polynomials
    - Laguerre Polynomials
    - Generalized Laguerre Polynomials
    - Hermite Polynomials
    - Chebyshev Polynomials & the "Connaissanse des Temps"
    - Chebyshev Polynomials of the first and second kind
    - The "Connaissance des Temps"
    - Ultraspherical Polynomials
    - Jacobi's Polynomials
  - Struve Functions
  - Theta Functions
  - Riemann Zeta Function
  - Weierstrass Elliptic Functions
  - Exponential , Sine and Cosine integrals (Updated)
  - Fresnel integrals
  - Error function (Updated)
  - Coulomb Wave Functions
  - Debye Functions
  - Dawson's Integral
  - Bell Numbers
  - Bernoulli Numbers
  - Complex Functions
  - The decimals of e
  - A Dice Problem
  - Dot Product and Cross Product
  - Discrete Hartley Transform
  - Double Integration
  - Date of Easter
  - Eigenvalues & Eigenvectors
  - Electric Circuits
  - Equation Solver
  - Equinoxes and Solstices
  - Euler & Eulerian Numbers
  - Fast Quadratic Formula
  - Feet-Inches-Fractions Calculator
  - Geometric Transformations
  - The Golomb Sequence
  - Henderson-Hasselbach
  - Hypermatrix and Magic Cubes
  - Hyperspheres
  - Jacobian Elliptic Functions and Elliptic Integrals
  - Lagrange's Interpolation Formula
  - Least-Squares Approximation
  - Linear and non-linear Systems
  - Creating a Matrix (Updated)
  - Min-Max Line
  - Multiple Integration
  - Number of Partitions
  - Polynomials
  - Polynomial Curve Fitting
  - Primes , Divisor Functions & Euler Function for the HP-41
  - Quaternions (hypercomplex numbers)
  - Quantiles
  - Random Number Generators
  - Roman Numerals
  - Romberg's method (Updated)
  - Implicit Runge-Kutta Methods (New/Updated)
  - Explicit Runge-Kutta Methods (New/Updated)
  - Simplex Method
  - Systems of Differential Equations (Updated)
  - Successive Approximation Method
  - Stirling Numbers
  - Series ( including the Euler acceleration method )
  - Spectral Analysis
  - Triangle Solutions
  - Triple Integration
  - 564 Chords
  - Conics
  - Einstein's Twin Paradox
  - Farey Sequences
  - Numerical Integration (Updated)
  - Quadrics
  - Ramanujan Tau Numbers
  - Surface Area of an Ellipsoid
  - Batrachions
  - Hyperbolic Functions
  - Hyperbolic Triangles
  - Spherical Triangles
  - Loxodromics
  - Extrema
  - Nth Order Differential Equations
  - Matrix Operations
  - Quadratic Hypersurfaces
  - Rational Function Interpolation
  - Determinants
  - Area of a Polygon
  - Volume and Area of a Polyhedron
  - Continued Fractions (Updated)
  - Spheroidal Harmonics
  - Base Conversion (Also see Math Pack below) (New)
  - Decimal to Fraction (New)
  - Numerical Differentiation (New)
  - Euclidean Distance (New)
  - Kaprekar Series (New)
  - Numerov's Method (New)
  - Osculating Polynomial (New)
  - The Laplace and Poisson Equations (New)
  - The Diffusion Equation (New)
  - The Bulirsch-Stoer Method (New)
- Physics / Chemistry
- Finance
  - Loan and Savings
  - FinCalc (German. Documentation available from author)
- Games
  - The Castle, an Adventure Game
  - Fruit/Slot Machine Game
  - Hangman Game
  - Poker (Updated)
  - Skunk Game
  - Mastermind
  - XOR Game
  - Le Compte est bon (a French TV game) (New)
  - Snakes & Ladders (New)
  - Blackjack (New)
  - Sphynx (a number guessing game) (New)
  - Mastermind (New)
- Miscellaneous
Antennas Solution Book
- Antenna Gain / Remote Transmitter Power
- Antennas
- Azimuth Pattern of Cylindrical Array
- Beam Pattern for Uniform Array
- Colinear Antenna Gain and Pattern
- Gain of Horizontal Rhombic Antenna 0 Azimuth
- Loaded Dipole Antennas
- Loaded Vertical Antennas
- Parabolic Antenna Calculations
- Planar Phased Array Radar Beam Positions
- RF Path Loss, dB
- Radar Antenna Beamwidth and Gain
- Short Wave Transmission Path Calculations
Applied Stats 1 Solution Book
- 2 Independent Samples F & T Tests
- 2 Related Samples T Test
- Comparisons Among Means
- Histogram Normality Test
- Latin Square ANOVA
- Mean and Confidence Interval
- Nested ANOVA
- Randomized Complete Blocks ANOVA
- Single Classification ANOVA
Applied Stats 2 Solution Book
- 3-Factor ANOVA
- Analysis of Covariance
- Factorial Experiments
- Linear Regression
- Non-Parametric Frequency Test
- Non-Parametric Rank Test
- Product Moment Correlation Coefficient
- Two-Way ANOVA
HP-67 Astrology Solution Book (ported to HP-41C)
- Astro 1 - Mean Obliquity of Ecliptic & GST
- Astro 2 - Moon Asc Node, Nutation, Vernal Pt
- Astro 3 - Local Siderial Time, Geocent Lat
- Horoscope Construction
- House Cusps - Campanus Methods
- House Cusps - Koch Methods
- House Cusps - Placidus Method
- House Cusps - Regiomontanus Methods
- House Cusps - Topocentric Methods
- Mundoscope, Campanus
- Mundoscope, Regiomontanus
Business Stats Solution Book
- Basic Statistics for 2 Variables
- Break-Even Analysis
- F Distribution
- Forecasting using Exponential Smoothing
- Gompertz Curve Trend Analysis
- Learning Curve for Manufacturing Cost
- Monthly Seasonal Variation Factors
- Moving Average
- Multiple Linear Regression
- Normal & Inverse Normal Distribution
- Price Elasticity of Demand
- T Distribution
Calendars Solution Book
- # M-Days bet. 2 Dates & Nth M-Day of Month
- Calendar Printout
- Calendar Printout for 82162 HPIL Printer
- Chinese Years to/from Gregorian Years
- Day of Year - Day of Week
- Holidays
- In What Year is a Given Date an M-Day?
- New Moon & Full Moon Day of Month
- Number of Weekdays Between 2 Dates
- Religious Holidays
- Calendar Date to Julian Date Conversion
HP-67 Calendars Solution Book (ported to HP-41C)
- Biorhythm
- Complete Maya Calendar (Card 1)
- Complete Maya Calendar (Card 2)
- Days <-> Dates, Day of Week
- Mohammedan (Islam) Calendar
Chemical Engineering Solution Book
- Conduit Flow
- Conservation of Energy
- Equations of State
- Heat Transfer (Cylinders/Walls)
- Hydrocarbon Combustion
- Nusselt and Biot Numbers
- Reversible Polytropic Process
- Reynolds Number
- Schmidt and Prandtl Numbers
- Single Stage Equilibrium Flash
- Stanton and Lewis Numbers
- Straight Fin Efficiency
- Von Karman Analogy
- Weak Acid-Base Titration Curve
Chemistry Solution Book
- Acid-Base Equilibrium (Diprotic)
- Activity Coefficients - Potentiometric Data
- Beer's Law and Absorptivity Calculations
- Crystallographic - Cartesian Transformations
- Equations of State
- Kinetics - Lineweaver-Burk or Hofstee Plots
- Mixture Viscosities
- Van de Waals Gas Law
- Weak Acid-Base Titration Curve
- pH of Weak Acid-Base Solutions
Civil Engineering Solution Book
- Beams Fixed at Both Ends
- Bolt Torque
- Cantilever Beams
- Compressive Buckling
- Properties of Special Sections
- Reinforced Concrete Beams
- Simply Supported Beams
- Steel Column Formula
- Stress in Thick-Walled Cylinders
- Vector Operations
Control Solutions Book
- Aid to Root Locus Plots 1 - Real Poles
- Aid to Root Locus Plots 2 - Complex Poles
- Bode of 3rd over 3rd*S^N Transfer Fn
- Bode of Transfer Function, Each Pole/Zero Given
- Classical Control Gains
- Convert Frequency Response - Open/Closed
- Frequency Response of a 3rd over a 4th order
- Frequency Response of a Transfer Function
- Routh Test for System Stability
- First Order Regulator
- Second Order Regulator
Electrical Engineering Solution Book
- Active Filter Design
- Bode Plot of Btwth & Chby Fltr
- Butterworth Filter Design
- Chebyshev Filter Design
- Class A Bias Optimization
- Frequency Response of Trans Fn
- RC Timing
- Transistor Amp Performance
- Transmission Line Calculations
- Transmission Line Impedance
HP-67 E.E. Pac 1 (ported to HP-41C)
- Active Filter Design
- Bilateral Design Gain and Stability Circles
- Bilateral Design Stability Factor, Max Gain
- Bode Plot of Butterworth and Chebyshev Filters
- Butterworth or Chebyshev Filter Design Input
- Butterworth or Chebyshev Filter Design Output
- Class A Transistor Amplifier Bias Optimization
- Fourier Series
- Microstrip Calculations
- Network Transfer Functions Input
- Network Transfer Functions Output
- Parameter Conversion
- Reactive L-Network Impedance Matching
- Resistive Attenuator Design
- Smith Chart Conversions
- Transistor Amplifier Performance
- Transmission Line Calculations
- Transmission Line Impedance
- Unilateral Design
- Transistor Configuration Conversion
HP-67 EE(lab) Solution Book (ported to HP-41C)
- 1% Resistor Value Subroutine
- Coil Calculations
- Complex Impedance Calculator
- L-Attenuator
- Ohm's Law
- Passive High and Low Pass Composite Filters
- RC Timing
- Reactance Chart (9 Equations)
- Series R-L-C Circuit Analysis Program
- Wheatstone Bridge
- Wire Table
- Wye <-> Delta Transformations
HP-67 Earth Sciences Solution Book (ported to HP-41C)
- Atmospheric Thermodynamics (HP41 port)
- Atmospheric Thermodynamics (Original HP67 translation)
- Bouguer Anomaly Gravity Reduction
- Depth of Strata
- Earthquake Magnitude-Energy Conversion
- Earthquake Seismic Wave (Shear Fault)
- Electromagnetic Seismograph Response
- Geocentric Distance - Azimuth
- Heat Flow - Geophysics
- P&S Seismic Wave Velocity Determination
- Physical Properties of Seawater
- Plate Tectonic Velocities
- Plunge and Rake of Faults
- Sigma-T and AOU
- Strata Thickness
- True and Apparent Dips
HP-67 Filters Solution Book (Ported to HP-41C)
- Butterworth Active Filter Desgn, Low Pass
- Butterworth and Chebyshev Filter Group Delay
- Butterworth and Chebyshev Filter Order
- Butterworth and Chebyshev Filter Response
- Butterworth and Chebyshev LP Normalised Coefs
- Normalised LP to BP Transformation, 1,2,6,7
- Normalised LP to BP Transformation, 8,9,10,11
- Chebyshev Active LP Filter Design #1
- Chebyshev Active LP Filter Design #2
- Normalised LP to BS, LP, HP Transformation
- Y-Delta Transform for L, R, C
Games Pac
- Initialize and Random Number
  (Common Routines needed by several of the programs below)
- Bagels
- Biorythms
- Craps
- Hangman
- Pinball
- Space War
- Subhunt
Games Solution Book
- 3 Dimensional Tic-Tac-Toe
- Flip-Flop
- Hexapawn
- Hunt the Wumpus
- Orbital Lander
- Planet Lander
- Robot Trap
- Scatter
- Simon
- Wari
Games II Solution Book
- Adventure
- Code Crack
- Flipo
- Mini Chess (Read data from IL device)
- Mini Chess (original)
- Pinball Utility Program
- Pinball Wizard
- The Caves
- Truck
HP-67 Games Pac 1 (ported to HP-41C)
- Artillery
- Biorhythms
- Bowling Scorekeeper
- Dice
- Game of 21 (Blackjack)
- Golf
- Hexapawn
- Nim_k
- Queen Board
- Racetrack
- Slot Machine
- Space War 1
- Space War 2
- Submarine Hunt
- Super Bagels
- Teaser
- The Dealer
- Tic Tac Toe
- Wari
- Timer
HP-67 Games Solution Book (Ported to HP-41C)
- Battleship
- Bell-Fruit (Mills Standard)
- Blackjack with a Permanent Bank
- Contract Bridge Scoring Pad #1
- Contract Bridge Scoring Pad #2
- Duplicate Bridge Score
- Hangman (HP41 Modified Version)
- Hangman (HP67 Original Version)
- Pro Football Simulation
- Risk
- Turn the Die
- Word Encoder
- Word Game Subroutine (HP41 Modified Version)
- Word Game Subroutine (HP67 Original Version)
HP-67 Games of Chance Solution Book (ported to HP-41C)
- 26 and 36
- Big Six
- Blackjack Betting
- Chuck-A-Luck
- Craps
- Dog Race (card 1)
- Dog Race (card 2)
- Horse Race
- Parapar
- Pig
- Roulette
Geometry Solution Book
- Distance between Lines in Space
- Grid of Points, Calculate All Points
- Grid of Points, Calculate Discrete Points
- Internal and External Tapers
- Line-Line Intersection
- Points of Tangency with Circles and Arcs
- Points on a Straight Line
- Sine Plate Solutions
- Tangent Circle to 2 Straight Lines
- V Notches and Long Radii
Home Const. Estimating Solution Book
- Concrete Volume
- Drywall & Insulation Estimate
- Framing Board Feet
- Linear to Board Feet Conversion
- Lumber Estimate
- Painting Estimate
- Sheathing & Subfloor Estimate
- Shingle Estimate
- Wall & Ceiling Areas Estimate
- Wallpaper Estimate
- Wood Floor Estimate
HVAC Solution Book
- Air Duct Conversion
- Air Flow in Circular Ducts
- Black Body Thermal Radiation
- Decibel Addition and Subtraction
- Equations of State
- Heat Exchangers (Main Program)
- Heat Exchangers Counter Flow Subroutine
- Heat Exchangers Cross Flow Subroutine
- Heat Exchangers Parallel Counter Flow Subroutine
- Heat Exchangers Parallel Flow Subroutine
- Insulation Break Even Analysis
- Overall Heat Transfer Coefficients
- Psychrometric Properties
- Temperature Conversion
High-Level Math Solution Book
- 16 Point Gaussian Quadrature
- 4*4 Matrix Operatiions
- Bessel Fns, Error Fn
- Characteristic Equation of 4*4 Matrix
- Chebyshev, Legendre, Hermite Poly
- Eigenvalues for 3rd-Order Systems
- Eigenvalues/Vectors of 3rd-Order
- Gamma Function
- Sine/Cos/Exponential Integrals
HP-67 High Level Math Solution Book (ported to HP-41C)
- 6 Simutaneous Equations Card 1
- 6 Simutaneous Equations Card 2
- Determinant and Inverse of 5*5 Matrix
- Incomplete Beta Function
- Incomplete Elliptic Integrals
- Incomplete Gamma Function
- Matrix Algebra
- Misc. Special Functions A
- Misc. Special Functions B
- Roots of Polynomials
Lend/Save/Lease Solution Book
- Add-On to APR with Odd Days
- Amortization Schedule
- Compound Interest Solutions
- Compound Periods Diff. from Pay Periods
- Constant Payment to Principal Loan
- Interest Conversions
- Lease with Add'nal Payments in Advance
- Rule of 78's
- Savings Plan
- Skipped Payments
HP-67 Math Pac 1 (ported to HP-41C)
- 4*4 Matrix Setup
- 4*4 Matrix Solutions
- Base Conversions (Modified for HP41)
- Bessel Functions, Error Function
- Circle Computations
- Complex Operations
- Coordinate Transformations
- Differential Equations
- GCD, LCM, Dec to Frac
- Gamma Function
- Gaussian Quadrature
- Hyperbolics
- Interpolations
- Intersections
- Numerical Integration
- Optimal Scale for a Graph, Plotting
- Polynomial Solutions
- Solution to f(x)=0 on an Interval
- Spherical Triangles
HP-67 M.E. Pac 1 (ported to HP-41C)
- Beams Fixed at Both Ends
- Belt Length
- Cantilever Beams
- Circular Cams
- Conduit Flow
- Cross Flow Heat Exchangers
- Equations of State
- External Involute Spur Gears
- Four Bar Function Generator Input
- Four Bar Function Generator Output
- Free Vibrations
- Gear Forces
- Helical Spring Design
- Isentropic Flow for Ideal Gases
- Linear Cams
- Parallel -- Counter Flow Heat Exchangers
- Parallel and Counter Flow Heat Exchangers
- Progression of Four Bar System
- Progression of Slider Crank
- Propped Cantilever Beams
- Section Properties - Input
- Section Properties - Output
- Simply Supported Beams
- Soderberg's Equation
- Stress on an Element
- Vector Statics
- Vibrations Forced by F0*cos(wt)
HP-67 Navigation Pac (ported to HP-41C)
- Bearing Line of Position
- Closest Point of Approach
- Distance by Horizon Angle
- Fix from Two Lines of Position
- Two Angle Line of Position
- Almanac Interpolator
- Beating to Windward
- Dead Reckoning
- Estimated Time of Arrival
- Great Circle and Rhumb Line Navigation
- Star Line of Position (Use with the 6 Star Data programs below.)
- Star Data 1
- Star Data 2
- Star Data 3
- Star Data 4
- Star Data 5
- Star Data 6
- Star Sight Planner
- Sun Line of Position
- Velocity Triangle and Course to Steer
HP-67 Optics Solution Book (Ported to HP-41C)
- First Order Raytracing by Matrix Methods
- Fraunhofer Diffraction by Spherical Particles
- General Lens Tracer
- Kubelka-Munk Diffusing Layer
- Lens Calculations
- Optical Desgin 2 (Trig Ray Trace)
- Optical Design 1 (Achromatic Doublet) (Card A)
- Optical Design 1 (Achromatic Doublet) (Card B)
- Paraxial Ray Tracing #1 - Tracing
- Paraxial Ray Tracing #2 - Storing
- Ray Trace
- Ray Trace Parabola
- Ray Tracing (Spheres, Paraboloids, Flats)
Optometry 1 Solution Book
- 4 Accommodative Rx's & Their Average
- Acuity Demand Letter Size & Working Dist
- Aniseikonia
- Contact Lens / Telescope Calculations
- Crossed Prism Resultant
- Effective, Equivalent, & Neutralizing Power
- Needed Magnification, Add, & Working Dist
- Oblique Cylinder Sums
- Positional Effective Power
- Pratt, Sheard, & Percival Methods of Near Rx
Optometry 2 Solution Book
- Back Vertex Power of PMMA Contact Lens
- Brungart 1 and 2
- Clens Pwr Necessary to Correct Ametropia
- Cylinder Induced by Toric Contact Lens
- Eff Pwr of Spectacle Lenses at Corneal Plane
- May-Grant Contact Lens of 1st Approximation
- Residual Cylinder at Tear/Cornea Interface
- Roggenkamp Specifications
- Tabb Contact Lens of 1st Approximation
- Toric Contact Lens Parameters
HP-67 Photo Dark Room Solution Book (Ported to HP-41C)
- Cibachrome Reciprocity Correction
- Color Print Processing (Unicolor B)
- Color Printing Factors
- Color Printing Factors ; New Paper
- Image Projection Data
- Macro-Photography and Enlarging
- Photo/Image Display Parameters
- Print Viewing Distance
- Subtractive CP Filters Density
- Time,F-Stop,Magnification,Paper Speed
- Tri-Color Print Exposure
Physics Solution Book
- 32-P Remaining on Day of Year
- Black Body Radiation
- Black Hole Characteristics
- Clebsch-Gordon Coefficients
- Delta-V Orbit Simulator
- Einstein's Twin Paradox
- Equations of Motion
- Isotope Overlap Corrections
- Semi-Empirical Nuclear Mass Formula
- Special Relativity Conversions
- Three-Dimensional Special Relativity
HP-67 Physics Solution Book (ported to HP-41C)
- Ballistic Trajectory
- Critical Reactor Code
Small Business Solution Book
- Account Posting
- Break-Even Analysis
- Depreciation
- Employee Data Card Initialization
- Estimating Inventory
- Inventory Ordering
- Invoicing
- Order Point Calculation
- Payroll
- Retail Inventory Monitor
- Tabluator
- Working Capital Needs, Bardahl Formula
Solar Engineering Solution Book
- Black Body Radiation
- Conduit Flow
- Economic Break-Even
- Energy Cash Flow
- Energy Equivalents - Fuels & Prices
- Heat Exchangers (Main Program)
- Heat Exchangers Counter Flow
- Heat Exchangers Cross Flow
- Heat Exchangers Par-counter Flow
- Heat Exchangers Parallel Flow
- Heat Transfer
- Solar Beam Irradiation
- Solar Panel Array
- Sun Altitude, Azimuth
- View Factor
HP-67 Space Science Solution Book
- Ballistic Missile Range
- Binary Star Ephemeris (HP-41 Modified Version)
- Binary Star Ephemeris (HP-67 Original Version)
- Celestial Position
- Horizon Distance, Great Circle Distance
- Kepler's Equation
- Local Siderial Timee and Obliquity
- Orbit Determination by Method of Gauss
- Precession / Galactic Coordinates
- Precession of Rt Ascension & Declination
- Vis Viva and Path Angle Relations
Standard Applications
- Arithmetic Teacher
- Blackjack
- Calendar Functions
- Curve Fitting
- Financial Calcultions
- Hexadecimal - Decimal Conversions
- RPN Primer
- Root Finder
- Vector Operations
- Word Guessing Game
HP-67 Standard Pac (ported to HP-41C)
- 3*3 Matrix Operations
- Annuities and Compound Amounts
- Arithmetic Teacher
- Calculus and Roots of f(x)
- Calendar Functions
- Curve Fitting
- Demo Functions (side 2 of Calculus and Roots)
- Diagnostic Program
- English - SI Conversions Side 1
- English - SI Conversions Side 2
- Follow Me
- Moon Rocket Lander
- Moving Average
- Polynomial Evaluation
- Tabulator
- Triangle Solutions
- Vector Operations
Test Stats Solution Book
- Bartlett's Chi-Square Statistic
- Behrens-Fisher Statistic
- Differences Among Proportions
- Fisher's Exact Test for 2*2 Contingency
- Intraclass Correlation Coefficient
- Kendall's Coefficient of Concordance
- Mann-Whitney Statistic
- Mean-Square Successive Difference
- One Sample Test Statistic for Mean
- Run Test for Randomness
- Ruskal-Wallis Statistic
- Test Statistic fr Correlation Coefficient
Time Module 1 Solution Book
- Appointment Calendar
- Appointment Load/Store for Card Reader
- Appointment Load/Store for Extended Mem
- Appointment Load/Store for HPIL
- Automobile Trip Computer
- Exercise Monitor
- Fast Playback
- Four Channel Controller
- Logbook
- Playback Programmable Timer
- Random Seed Generator
- Read HP3468A Voltmeter
- Trip Computer Calibration
- World Time Converter

These programs are supplied without representation or warranty of any kind. Neither the original authors, nor The Museum of HP Calculators assume any responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of these programs or any parts thereof.

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