Abstract: A manual data input facility of a machine control includes graphically assisted input. An MDI main display and lead-through graphic displays are generated to facilitate selection of functions and entry of associated data. The displays make use of graphic icons and text recognizable by an operator. Input devices advantageously include a contact actuated touch screen and numeric keypad. A graphic assisted MDI mode of operation generates instruction blocks conforming to a predetermined user programming convention in response to operator selections and numeric data input. The operator initiates execution of instruction blocks so generated, one block at a time, by operation of a Cycle Start input.