LXVII is an emulator of the classic HP-67, RPN based, programmable calculator for OS X. Notable features of LXVII are: - The ability to execute multiple active calculators, each with separate programs and data contents. - Full visibility of all data and program memory. - A paper tape register that supports manual print-out as well as automatic and program trace modes. - Each button has a keyboard equivalent to minimize mouse requirements. Version 1.5.0 adds support for the Mac App Store as well as the following features: - Copy paste support for the number being displayed - Delete key support to edit the number currently being entered - Better support for the paper tape register functions - Bug fixes as reported by users