Macintosh Performa - Appendix D Installing Network Management Software; Installing NetWare client software

3Rotate the SIMM gently to the back until you feel it snap into place.
The plastic pin on the SIMM slot
should engage the hole in the SIMM.
Be sure that the metal clips snap into place.
Rotate the SIMM back until it snaps into place.
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Installing an Expansion Card or Memory for the PC Environment