Mastercode is a substantial and complex program, providing a host of features of use to anyone interested in machine code programming on the Commodore 64, Despite its complexity Mastercode is designed with the user in mind and is far easier to use than many inferior assembler/disassemblers. All of Mastercode's many facilities are called up by means of clear menus and prompts which appear as the program runs. There are no obscure commands to enter to make full use of Mastercode and with an hour or so's practice you will be making the most of its power.