NEC LS2400 Service & Reference Manual page 91

Note:
If you are adding a non-Plug and Play Legacy ISA
option board, run the SSU before installing the board. For
details on the SSU, refer to Appendix B.
7. Holding the board by its top edge or upper corners, firmly press the
board into an expansion slot on the system board. The tapered foot
of the option board retaining bracket must fit into the mating slot in
the expansion slot .
8. Align the rounded notch in the retaining bracket with the threaded
hole in the expansion slot frame. The retaining bracket fits into the
space that was occupied by the expansion slot cover.
9. Reinstall the screw in the threaded hole. Be sure to push the bracket
slot up against the screw before you tighten it. If this is not done, the
bracket may interfere with an adjacent bracket.
10. Connect any external cables (if they are needed) to the installed
option board.
11. Replace the left side panel and power on the system.
A
B
Installing an Option Board
Upgrading Your System 4-19