Yamaha SY85 Owner's Manual page 359

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288 WAVE MEMORY EXPANSION
APPENDIX
INSTALLING SIMM MODULES: The right panel accomodates compat-
ible SIMM memory modules. Two SIMM modules (1 megabyte each) must
be installed in connector CN13.
Replace the expansion slot cover and attach with the six screws removed
in step 3.
Once installed, SYEMB06 memory expansion modules cannot
be removed (the plastic rivets lock the boards in place). Have
your Yamaha dealer remove installed modules to avoid possible
damage.