IBM 3270 Manual page 173

If your control program is on a system
diskette, insert it into the default drive, or
change the default drive.
If your control program is on your fixed disk,
make sure that the fixed disk is the default.
For example, if your default drive is A and
your control program is on your fixed disk,
type:
I
A>,
Your default drive will change to C:
3. Type: type autoexec. bat.
I
A>typ. ,"to".'.bol
4.
Press the Enter key.
The contents of your AUTOEXEX.BAT file
will appear on your screen.
5. Make sure that there are no INDRSTR
commands in the file.
6. If they are there, you do not need to add them
again. If they are not, continue.
12-2 Book 3 - Using the Control Program