Setting 103 (CYC START/FH SAME KEY)
When Setting 103 is on, the CYCLE START button functions as the Feed Hold key as well. When CYCLE START is pressed and held in, the machine will run through the program; when it's released, the machine will stop in a feed hold. This gives you much better control when setting up a new program.
This feature should be turned off when you're done using it. Setting 103 can be changed while running a program, but it cannot be on when Setting 104 (below) is on.