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Free42 for Android

Use an HP-42S-style programmable scientific calculator on Android, with decimal arithmetic, HP-42S program support and printer simulation.

AndroidFree and open source; GNU General Public License version 2Version 3.4.1
Download for Android (APK)

Version 3.4.1 · Direct publisher file

Link checked · Download guidance

What is Free42?

Free42 recreates the HP-42S scientific programmable calculator and HP-82240 printer on Android. It is a complete rewrite that needs no HP ROM image. Its calculator interface and ability to run HP-42S programs make it useful for continuing an existing HP-42S workflow on a phone. The publisher lists Android 4.4 or later and provides an APK for manual installation alongside a Google Play listing.

The Android edition uses decimal arithmetic; unlike the desktop packages, it does not include a binary-arithmetic edition. You can copy and paste numbers, matrices and program listings, or save calculator states containing programs, variables and settings. Check imported program listings: the parser silently ignores text it does not recognize as HP-42S instructions, so a pasted program can be incomplete without an error.

What it offers

  • Run programs written for the HP-42S without an HP ROM image.
  • Use the decimal-arithmetic edition of the calculator on Android.
  • Copy and paste real or complex numbers, matrices and program listings.
  • Save, share and switch calculator states containing programs, variables and settings.
  • Use HP-82240 printer simulation.

Good to know

  • Pasting program text silently ignores unrecognized instructions; compare the imported program with its source listing.
  • Android is Decimal-only; the Binary edition included in desktop packages is not provided for Android.

Product images

Free42 on Android showing a two-line calculator display, scientific function keys and numeric keypad inside a phone frame.
Free42 on Android showing a two-line calculator display, scientific function keys and numeric keypad inside a phone frame. Image source ↗Screenshot from Thomas Okken’s official Free42 page, beside the Android download entry. Software is GPLv2; separate screenshot republication permission was not stated. Image and device-frame rights remain with their respective owners; public availability is not a permission grant.

Sources

References used for this listing. Retrieval dates do not indicate hands-on testing.

  1. Free42 : An HP-42S Calculator Simulator ↗Retrieved

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