Macintosh IIcx
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Honey, I shrunk the IIx. The Mac IIcx was essentially a IIx stripped of three NuBus slots and given a smaller power supply. All this created a computer considerably more compact than the earlier Mac IIs.
These Iicx was a big improvement over the larger Mac IIs for memory upgrade: you need only remove the cover to access the SIMM sockets.
When upgrading, be careful not to damage the SIMM sockets, especially if you are removing memory. Although the IIcx shipped with 1 MB of memory, odds are pretty good it's already been upgraded beyond that point.
Looking at the motherboard with the connectors to the rear and power supply in the right rear, you will see eight SIMM sockets. The four on the right are Bank A. The four on the left are Bank B. Memory must be installed in sets of four 30-pin SIMMs rated at 120ns or faster.
A 1 MB configuration has four 256 KB SIMMs in Bank A; a 2 MB configuration has 256 KB SIMMs in all eight sockets.
For a 4 MB or 5 MB configuration, place four 1 MB SIMMs in Bank A. Leave Bank B empty for 4 MB; install four 256 KB SIMMs for 5 MB.
The 8 MB setup requires 1 MB SIMMs in all eight sockets.
For 16-32 MB configurations, place four 4 MB SIMMs in Bank A. Leaving Bank B empty produces 16 MB total. Adding 256 KB SIMMs bumps this to 17 MB. Using 1 MB or 4 MB SIMMs in Bank B produces 20 MB and 32 MB, respectively.
- Although the IIcx supports 16 MB SIMMs, Apple's memory guide gives no details on installing them. I suggest you install the first bank of 16 MB SIMMs in Bank A, since that follows the pattern established with other configurations. Bank B can then hold 1 MB, 4 MB, or 16 MB SIMMs. You can have up to 128 MB in the IIcx.
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.
<go to memory upgrade index or Macintosh IIcx>
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