IBM NetVista 6049 Manual page 22

IBM NetVista
that they can only be installed correctly. Check that the cutouts
on the DIMM module edge connector match the notches in the
DIMM slot:
Latch
Notches
2. Push the latches on each side of the DIMM slot down.
3. Install the DIMM module into the slot and press it firmly down so
that it seats correctly. The slot latches are levered upwards and
latch on to the edges of the DIMM when it is installed correctly.
Latch
Cutouts
Cutouts
Latch
Notches
Latch
22/53