If you understand this then you my friend truly are a geek sys 64738 is a commodore 64 rom routine that would reset the computer as if it were turned off and then on again this command was useful since this commodore lacked a reset button and was better than turning the computer off and then on again because it retains some data in ram and that means you could get back to playing classic video games like maniac mansion pirates and elite that much quicker wow nerdyour ceramic mugs are