Defines a machine readable input format for Computer Numerical Control (CNC) drilling and routing machine tools used by the printed wiring board industry. The format may be used to transfer drilling and routing information between printed board designers, manufacturers and users or as the output CNC standard from converters that expand higher level design input such as IPC-D-350 data. Provides a common command structure that can assist in the board manufacturing process and is not intended to provide for every possible software enhancement. 6 pages. Released August 1985.