http://www.macnn.com/articles/08/09/04/pcalc.33.update.for.mac/
PCalc 3.3 improves undo/redo and RPN
updated 02:55 pm EDT, Thu September 4, 2008
PCalc 3.3 update for Mac
TLA Systems today announced the newest version of its calculator software, PCalc 3.3. PCalc is a scientific calculator with tools for quick conversion of units. This Mac OS X edition follows the release of a PCalc update for the iPhone, and mirrors its improvements. An improved RPN mode, for example, allows the calculator to work more like the HP calculators the software is modeled after.
Undo and redo functions have been improved, and the overall interface has been overhauled for a more modern look. PCalc 3.3 is available free for registered users of version 3, $10 as an upgrade from version 2, or $20 under a new single-user license.
