|HP 42S simulators on ipod touch--I answered my own question|
Message #1 Posted by bill platt on 28 Dec 2009, 1:46 p.m.
I have read this thread:
and so I think I understand that basically:
1. Thomas Okken wrote a stand-alone simulator of the 42S functionality (as distinct from an emulator which requires a ROM image) and compiled it to run on the iPod and iPhone, naming it "Free42". (also compiled to run on Palm, WinCE, and Windows under separate releases)
2. Byron Foster ported Thomas' Free42 to create an extension of Thomas' tool, adding some new ideas which are not strictly compatible in every case with an original HP 42S. He named it "42s RPN Calculator."
3. Another port of Thomas' Free42 appears on the ipod apps page: "RPN Calc 42S."
This last app seems to use text in the description which is mostly identical to Byron's version. Does anyone have any background on this? I now see that Thomas describes this at his own web-page, as being a release of one of Byron's earlier edits, by a third party. I guess this is something that can happen with GNU licensing?
Here is what the descriptions are:
and here is a screen capture if the link changes (what I saw):
As far as emulators go, I know Thomas knows all about emulators--and I though he had made some of them, but perhaps most of them all come from Christophe.
42S emulation: http://hp.giesselink.com/emu42.htm
Edited: 28 Dec 2009, 2:03 p.m.