IBM 3270 Manual page 249

INDST
User Response: Go back to Chapter 13, and
continue with question 2 to locate the cause of
the failure.
INDST005 Unable to load INDSNUM.COM
from disk
Explanation: The 3270 PC Control Program
cannot load this module from a diskette or disk.
User Response: Enter the DOS directory
command, DIR, to check whether
INDSNUM. COM exists. If it exists, type
INDSNUM and press Enter. If it still fails, use
your backup diskette to IPL the system.
A-64
Book 3 - Using the Control Program