The Museum of HP Calculators

HP Calculator Simulations

These programs are not Hewlett-Packard products and are supplied without representation or warranty of any kind. The authors and The Museum of HP Calculators therefore assume no responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of these programs or any part thereof.

HP-25 (Java)

This fantastic Java simulation was written by Larry Leinweber and donated to the museum.

• To work the calculator, press the keys by clicking with the mouse and slide the switches by dragging.
• The calculator should behave exactly like a real HP-25 except for computational accuracy. (This simulation computes to about 17 digits and trig functions for very large angles are always taken as zero.) The calculator is programmable and if you turn it off, you'll see that it's not an HP-25C.
• Because the slanted face legends can be hard to read, if you leave the mouse over a slide switch or key for one second, a hint will appear in square brackets on the title bar of the window.
• The applet code is public domain.

Java capable browser required <<< When the R/S button appears, click to start the applet window. (This may take awhile by modem as there are 130K bytes to download.)

Planimeter (Java)

Larry Leinweber has written another great simulation and made it available here.

HP-16C (Windows)

WRPN is a public domain calculator for Microsoft Windows written by Emmet P. Gray that is modeled after the Hewlett-Packard HP-16C Computer Scientist Calculator. WRPN comes with full source code, written in Borland C++ v4.0. The program requires two DLL files (included).

The simulation isn't programmable, doesn't support word sizes larger than 32 bits and has a few other minor differences from the real machine but is still very nice. Download the program, unzip it and follow the easy installation directions in the readme file. The zip file is approximately 200K. A 10K screen shot is also available.

HP-41C (Windows)

Ttcalc is a public domain programmable calculator for Microsoft Windows written by Stefan Seiwerth that is modeled after the HP-41C series of calculators. Download the program, unzip and run ttcalce.exe for the English version or ttcalc.exe for the German version. (The help file for either version is in German.) The Zip file is approximately 524K. A 10K screen shot is also available.

Simulations at other sites:

• HP-67 (Unix or Apple GS)
• Classic Series and HP-41C simulators (Unix & X Windows)
• HP 41C emulator (Dos)

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