IBM 1200 Hardware Maintenance Manual page 150

Note: The screw does not separate from the memory
cover.
To install the memory card:
With the notched end of the memory card toward the right
side of the socket, insert the memory card, at an angle of
approximately 20°, into the socket; then press it firmly.
Pivot the memory card until it snaps into place.
Side View
1040 Hard disk drive assembly
v "1020 Battery assembly" on page 138
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ThinkPad i Series 1200/1300 HMM