is supplied through the line 11 to the memory address control unit 8 where the signal is multiplied by n integer the value n is usually 128 or 256 bytes and is stored in the unit 8 the output of the unit 8 is supplied through the memory address control line 12 to the memory 6 now suppose that a specified memory storage start command arrives for example g25 since such a preparation command is given in g code according to the eia and iso standards all the subsequent commands are sequentially stored in the memory by taking as the initial address m u00d7 n delivered on the line 12 where 34 m 34 is the value stored in the register 7 and 34 n 34 is an integer stored in the unit 8 until a specified memory storage termination commmand arrives for example g26 next when the nc receives a code for example g24 which commands the execution of the program stored in the memory the input output control unit 4 will no longer read any command from the paper tape reader 3 while it will read and continue to read sequentially the command data stored in the memory 6 by.