• Support for iPhone Duo: the calculator uses the full display when the phone is open and keeps clear of the camera cut-out, so no key is hidden. • The display shows an annunciator only while it is on, as on the real calculator; nothing is ghosted when the calculator is off.

Program files • Import and Export Program are now available to everyone, during the trial too. • The handbook has a new Program Files chapter describing the .16c file format, the headers my16c adds and the keycode conventions. Handbook • Find in the handbook: ⌘F on the Mac, the magnifier in the toolbar on iPhone and iPad. Fixes • The trial period is now counted correctly on every launch.

• Program files. Save the program in memory to a file and load programs from files, in the .16c format of the JRPN simulator and rejig, with a title, notes and the modes the program was written for. Import shows the file before it touches the calculator. Part of the full version. • Fast typing no longer loses keys. Each keystroke is handed to the calculator the moment it is ready for it, exactly as the original keyboard did. • Holding a key behaves as on the real machine: SST and BST scroll through program lines at the original pace, even with Real Speed off. • The Owner's Manual can now be searched and has a new chapter on program files. • The Real Speed switch in Settings now does what it says. Off, the calculator runs about forty times faster than the original.

• Completely rewritten Owner's Manual. The full HP-16C handbook, page by page: every section, every worked example, the stack diagrams, the shift and rotate diagrams, both IEEE format-conversion programs, the Function Summary and a linked Subject Index. Display readouts are typeset exactly as the calculator shows them. • New appendix on the Voyager series: how the 16C compares with the 10C, 11C, 12C and 15C. • Low-battery indicator: the LCD's "*" annunciator now reflects your device's battery, just as it did on the original.

Self-tests are here! This update brings the calculator's built-in diagnostic tests to life, working exactly as on the original hardware: • Self-test — hold × and ON: the ROM runs its full diagnostic and finishes with the famous all-segments display • Keyboard test — hold ÷ and ON, then press every key in sequence • Continuous self-test — hold + and ON for the endless diagnostic loop All three are also available from the Calculator menu on Mac. Under the hood: • More accurate emulation of the display driver hardware, verified against a real calculator • The display now shows the complete set of annunciators, positioned to match the original LCD glass • Improved handling of simultaneous key presses Thanks to the community at the Museum of HP Calculators forum for the sharp observations that led to this update!

You can now switch between period and comma as the decimal separator, just like on the original calculator. Turn off the calculator, press and hold the decimal point key, then tap ON. The radix mark and digit separator will swap instantly. Also fixed: display annunciator labels now match the original HP hardware.