4121A NO ALTERN DRIVE ASSGN SYSxxx=cuu
Cause: The indicated logical unit (SYSPCH, SYSLST, or SYSOUT) is assigned to a magnetic
tape on which end—of-reel has been reached. No alternate tape has been assigned.
System Action: This message is preceded by message 4122I. The tape file is closed (a
tapemark written, the tape rewound and unloaded), and the system waits for an operator
Operator Action: Mount a new tape and type NEWTAP to continue processing.
Note: NEWTAP is the only valid response to this message.
Used with Courtesy and Permission of International Business Machines, Inc.