This bridgeport 412f 1990 was in a school used for programing and repair I jumped the n/c relay to turn on first screen you get 452 -04 and order made # next screen 1 load from I/O OR RUN LAST OPTION IS LOAD WITH OUT PMC THE ONLY ONE THAT YOU CAN LOAD PRAMS AND SUB SCREENS AND B TOOL SIDE OF MACHINE TO THE READY STATE BUT CAN HOME OR ENTER ANY INFO IN PROGRAM SCREEN BUT YOU CAN IN BACKGROUND EDITING ANY HELP THANKS MIKE