def do_db(self, arg):
        """
        [~thread] db <register> - show memory contents as bytes
        [~thread] db <register-register> - show memory contents as bytes
        [~thread] db <register> <size> - show memory contents as bytes
        [~process] db <address> - show memory contents as bytes
        [~process] db <address-address> - show memory contents as bytes
        [~process] db <address> <size> - show memory contents as bytes
        """
        self.print_memory_display(arg, HexDump.hexblock)
        self.last_display_command = self.do_db