Mac IIsiLow End Mac Reader Specials
The Mac IIsi was essentially a compacted IIci. It used the same architecture, sharing the first 1 MB of RAM for video and computing. When upgrading, be careful not to damage the SIMM sockets, especially if you are removing memory. The IIsi shipped with 2 MB of memory, one megabyte soldered to the motherboard and the other with SIMMs. Looking at the motherboard with the connectors to the rear, you will see four SIMM sockets on the left side of the board. They should already have memory in them. The IIsi supports 256 KB, 512 KB, 1 MB, 2 MB, 4 MB, and 16 MB SIMMs (although the Apple memory guide doesn't mention the 16 MB ones), leaving several upgrade options. With Bank A soldered in place, there is only one place to install memory. This simplifies matters when compared with the IIcx or IIci. The IIsi uses 30-pin SIMMs rated at 100ns or faster. A 2 MB configuration has four 256 KB SIMMs. A 3MB configuration has four 512 KB SIMMs. A 4 MB setup uses four 1 MB SIMMs. A 9MB configuration requires four 2 MB SIMMs. For 17 MB, install four 4 MB SIMMs. For 33 MB, install four 8 MB SIMMs. For 65 MB, install four 16 MB SIMMs. After 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 it doesn't give the expected number, you should reseat your memory. Once you know the upgrade is a success, pop on the lid and enjoy the extra memory. I suggest you increase the size of the disk cache for better performance.
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