add a 'd' command key to display the description of the current command. This is useful when running in simulation mode and we want to understand why a command is needed.
add a 'd' command key to display the description of the current command. This is useful when running in simulation mode and we want to understand why a command is needed.

rgardler/simdem,rgardler/simdem,rgardler/simdem,rgardler/simdem