This is a simulator of the Motorola 68HC11 microcontroller. It has been ported from a UNIX/MS-DOS version by Ted Dunning, requires at least 500 KB of RAM and Sys 7 (if this is a problem I can look for back-compat.). This version (1.1.4) fixes some bugs relating to condition-codes and idiv/fdiv instructions, but it is a PRELIMINARY one. I plan to distribute a more stable version within a few weeks, because I am currently embedding (is it the right word) a small Scheme interpreter (SIOD) in the simulator to ease interaction and scripting facilities. I will try to interface it with a real 68HC11 board, so if you have suggestions and bug-reports, I am available via E-mail as sarago@paola.dei.unipd.it . Many thanks, Tomaso