You can install up to 128 MB of RAM in the IIci.Īfter installing memory and reconnecting your drives, boot your Mac with extensions off (hold down the shift key) and check “About This Macintosh” under the Apple menu. If there are two banks, the higher capacity SIMMs should be in Bank B. If there is only a single bank of memory, it must be in Bank A. The list could go on, but I’m sure you see the picture already. You can reach 16 MB with four 4 MB SIMMs in Bank A or 2 MB SIMMs in all eight sockets. You can also use four 2 MB SIMMs in Bank A to achieve 8 MB.įor configurations of 9MB, 10 MB, or 12 MB, install 2 MB SIMMs in Bank B and 256 KB, 512 KB, or 1 MB SIMMs in Bank A, respectively. To reach 8 MB, you should have 1 MB SIMMs in each of the eight sockets. This was standard from the factory.Ī 2 MB configuration has 256 KB SIMMs in all eight sockets or four 512 KB SIMMs in Bank A.Ī 3 MB setup has four 512 KB SIMMs in Bank B and four 256 KB SIMMs in Bank A.Ī 4 MB configuration can have four 1 MB SIMMs in Bank A or 512 KB SIMMs in all eight sockets.įor 5 MB, install 256 KB SIMMs in Bank A, 1 MB SIMMs in Bank B.įor 6 MB, install 512 KB SIMMs in Bank A, 1 MB SIMMs in Bank B. (Apple states this in the Apple Memory Guide but does not follow this advice when listing memory configurations.) Bank A must always be populated.Ī 1 MB configuration has four 256 KB SIMMs in Bank A. Contrary to earlier Mac II models, which do not have onboard video, higher capacity SIMMs should always be in Bank B, because Bank A is used for internal video.
The Mac IIci accepts more SIMM capacities than any previous model – 256 KB, 512 KB, 1 MB, 2 MB, 4 MB, 8 MB, and 16 MB – leaving a multitude of upgrade options.
If you have a Mac IIci with a parity logic board, you must install parity memory. There is a less common version of the Mac IIci that uses parity memory, which has an extra data line. (If you are upgrading a IIcx to a IIci, be sure to check RAM speed, since the IIcx works only requires 120ns or faster SIMMs.)
Memory must be installed in sets of four matching 30-pin SIMMs per bank rated at 80ns or faster. Looking at the motherboard with the connectors to the rear and power supply in the right rear, you will see eight SIMM sockets. Although the IIci shipped with 1 MB of memory, odds are pretty good it’s already been upgraded beyond that point. When upgrading, be careful not to damage the SIMM sockets, especially if you are removing memory. The IIci was the first Mac with “32-bit clean” ROMs.Īs with the Mac IIcx, you need only to remove the cover to access the SIMM sockets. New features included built-in video and a Level 2 (L2) cache socket.
The Mac IIci took the popular Mac IIcx design and replaced its 16 MHz logic board with a 0-based design.