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=== RAM Configuration === * '''Soldered RAM''': 1 MB on logic board * '''SIMM Slots''': 4 ร 30-pin SIMM slots * '''SIMM Speed''': 100 ns minimum * '''Maximum RAM''': 17 MB (Apple official), 65 MB (with unofficial 16 MB SIMMs) * '''SIMM Installation''': Must be installed in matched groups of four identical SIMMs * '''Supported SIMM Sizes''': 256 KB, 512 KB, 1 MB, 2 MB, 4 MB (8 MB and 16 MB SIMMs work but are not officially supported) The IIsi's 1 MB of soldered RAM cannot be removed or disabled. When calculating total RAM, add this 1 MB to the SIMM capacity.<ref>{{cite web |url=https://support.apple.com/en-us/112193 |title=Macintosh IIsi: Technical Specifications |publisher=Apple Inc. |access-date=2026-02-09}}</ref>
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