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IBM 3741 Operator's Manual page 45

Data station
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Disk 2 Address
Displays the disk address of the second disk.
Machine Mode
Indicates the machine mode you are currently in. The
commonly used modes and their codes are: E=Enter, U=Up-
date, V=Verify, C=Field Correct, X=Read Index, S=Search,
and M=Modify Index.
Alternate Record Advance
Indicates the machine is in a mode which bypasses all fields
beyond the cursor position when you press REC ADV in
Enter mode.
Machine Status
Shows status of the machine. The codes for this are N=Not
Ready (diskette isn't loaded), W=Wait, and R=Ready.
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