IBM RT User's Setup Manual page 260

3. C onnect any cables you disconnected earlier. Then, to install
the rear cover, slide the cables into the slots in the cover.
a. Insert the bottom hooks in to the holes.
b. Push down on the cover.
c. Insert the top clips in to the loops.
4. Insert the key into the keylock and tu rn the key clockwise.
After you have in sta lled the options, it is im portant to record
h a rd w are changes on the record stored in the system. Verify the
Section 3. Installing A dapters in All Models
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