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During number entry, if you backspaced over a negative number until only the minus sign remained, that minus would not be parsed correctly, and you could get . For example, 1 +/- <- ENTER.

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.
It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image.
Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2.
All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.

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October 26, 2019
arm64-v8a + armeabi-v7a
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