Free42 vs my12c

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.

The financial calculator that has been on every banker's, broker's and realtor's desk since 1981 — now on your iPhone, iPad and Mac. my12C brings the legendary 12C Voyager series financial calculator back to life with cycle-accurate emulation running the original microcode. Every keystroke, every display flicker, every RPN operation — faithfully reproduced. WHY THE 12C NEVER WENT AWAY The 12C is the longest-lived calculator ever made, and for good reason: its time-value-of-money keys, cash-flow analysis and RPN logic solve real financial problems in a handful of keystrokes. It is still the calculator used in finance courses and licensing exams around the world. FEATURES • Cycle-accurate emulation — runs the original Voyager microcode, not a simulation • Time value of money — n, i, PV, PMT and FV, solve for any of the five • Amortization — interest and principal for any range of payments • Cash-flow analysis — NPV and IRR for up to 20 grouped cash flows • Bonds — price and yield to maturity on the 30/360 basis • Depreciation — straight-line, sum-of-the-years-digits and declining-balance • Calendar — days between dates and date arithmetic, actual and 30/360 • Percentages, simple interest, odd-period compounding, statistics and linear regression • Programmable — up to 99 lines, with conditional tests, branching and looping • RPN entry — the efficient Reverse Polish Notation four-level stack • Authentic 7-segment LCD display with all original annunciators • Built-in self-tests, working exactly as on the original hardware BUILT FOR TODAY • Complete Owner's Manual inside the app — every section, worked example, cash-flow diagram, formula and program listing of the original handbook, with a linked subject index • iCloud sync — your calculator state follows you across devices • Native on iPhone and Mac — landscape optimized on iOS, resizable window on macOS • Full keyboard support on Mac — type numbers and operators directly, Enter on the numeric keypad works as ENTER • Dark interface faithful to the original Voyager design