IBM 704 - Manual (Page 192)

Installing Internal Drives
To install a drive in a hot-swap bay, do the following steps:
1. Open the EMI metal panel, using the three thumbscrews.
2. Grasp the plastic lever on an empty carrier and pull the lever
toward you.
3. Remove the empty carrier 2 from the bay 1 .
1 2
The SCSI IDs (0–5) for the hot-swap drive connectors on the
backplane are shown in the following illustration.
1 2 0
3 4 5
174 PC Server 704 User's Handbook