3 Rotate the SIMM gently to the back until you feel it snap into place.

Rotate the SIMM back until it snaps 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.

Installing an Expansion Card or Memory for the PC Environment

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Apple 640 manual Rotate the Simm back until it snaps into place