LXVII 1.1

LXVII is a faithful simulation, of the Hewlett-Packard HP-67 programmable scientific calculator. It has the same stack depth and number of memory registers and program steps as the original. The button layout, numeric display formats and program key-codes are also similar although the display has been expanded to 14 significant digits with a 3 digit exponent. New features were designed with the intent that they extend existing features in a compatible manner. New features include: It is document based, so multiple calculators can be active at the same time. It is multi-threaded so multiple programs can be running at the same time on as many CPUs as are available on the system. The document based architecture, along with user defined function keys, allows users to redefine LXVII's functionality so that each document is essentially a new calculator, tailored to the user's specific task. A paper tape panel like that found on the hp-97 desktop calculator is provided for printing out memory registers, intermediate stack values and program listings. A pull-out drawer can display the current values of the stack, the last-X register, the program counter, all memory locations and all program steps in memory. All values except the program steps can be edited directly within the drawer interface. All buttons have an assigned single-keystroke key so that the user can get to all calculator functions without the need of the mouse. All buttons and button labels have active tooltips specifying the button's functions and it's shortcut.