IBM 3270 Manual page 258

INDSY
INDSY059 Read failure on drive: x
Explanation: A problem occurred while reading.
The variable x may be the disk drive identifier
such as a: or b:. If a question mark appears, the
failure was on a device other than a disk drive.
User Response: Check any device you are
attempting to use.
INDSY060 General failure on drive: x
Explanation: A problem occurred while using a
device. The variable x may be the disk drive
identifier such as a: or b:.
User Response: Check any device you are
attempting to use.
INDSY063 DOS inaccessible. Check all PC
sessions
Press any key to continue
Explanation: Multi DOS system may be locked
due
to
a critical error such as attempting to
write on a write-protected diskette or having a
drive door open. Thus, a DOS error has occurred
in a personal computer session.
User Response: Check all personal computer
sessions and correct the error. Press any key to
continue.
INDSYIOI System error - xxxx
Press any key to continue
Explanation: This error occurs while the system
is loading the control program.
User Response: Go back to Chapter 13, and
continue with question 2 to locate the cause of
the failure.
Appendix A .. Messages A-73