0Indicating normal termination of a read operation
2: Indicating that the terminator sequence was too long
9: Indicating a default for all other errors
For Sequential Disk and Tape Files I/O:
0: Indicating normal termination of a read operation
9: Indicating a failure of a read operation
GT.M does not permit the SET command to modify $ZA.
For more information on $ZA, refer "Input/Output Processing".