Apple Macintosh Performa 6100 Series - Manual (Page 106)

11 Replace the cover on the computer.
WARNING Always replace the cover before turning the computer on.
3 Press down on the latches to snap them into place.
1 Lower the front end of the cover
and slide it toward the back.
2 Engage the ribs on
the bottom case with the slots in the cover.
96 Appendix B