Free42 is a complete re-implementation of the HP-42S calculator and the HP-82240 printer. Free42 was written from scratch, without using any HP code. You do not need any ROM images in order to use it, yet it is fully HP-42S compatible.
Update Description:
12-04-2008: release 1.4.43
* MacDashboard version: fixed event handling so that program execution now works. There's still plenty of room for improvement: key timeouts (so pressing and holding a key behaves like it does on the real HP-42S and on the other Free42 versions) and auto-repeat come to mind... But at least programs, the solver, the integrator, and interruptible matrix functions should all be usable now.
10-03-2008: release 1.4.42
* Pocket PC version: I added a HI_RES_AWARE resource so that Free42 will now be able to take advantage of high-resolution displays without the help of Tweaks2k2 or similar utilities.
11-01-2008: (no new code release)
* Added "Khor" skin for Windows and Unix versions (Free42Skins.zip package). Contributed by Michael Khor.
01-01-2008: release 1.4.41
* PalmOS version: when opening the print-out database fails with a 0x0209 error (database corrupt), it now deletes the database, creates a new one, and tries again.
