To upgrade to 2.5 MB, remove the 256 KB SIMMs from Bank A, being careful not to damage the sockets. You can then solder it back together should you want to restore your Mac Plus to its original 1 MB configuration. If you might revert to 1 MB at some time, clip one end of each and bend it out of the way. If you don’t plan on downgrading back to 1 MB, you can remove them completely. Bank A is the rear pair of sockets Bank B is the one nearer the front of the motherboard.Īpple Memory Guide says you must clip both the R8 and R9 resistors to use 1 MB SIMMs. Looking at the motherboard with the connectors away from you, there are four SIMM slots. Be careful.Ĭarefully remove the power, floppy drive, and other cables from the motherboard, then slide it out of its mount. Under no circumstances come into contact with the pins on the back of the video tube.
#2016 mac motherboard replacement cracker
A case cracker is recommended for separating the front and rear of the case, but you can do it without one. Two are near the bottom, one behind the battery cover, and the other two way down inside the handle.
You will need a long (at least 6″/15cm) T15 Torx screwdriver (such as the Craftsman Professional series T-15 Torx screwdriver, #47431) to remove five screws from the back of the case. SIMMs must be installed in pairs and replace the 256 KB SIMMs already on the motherboard. It can be upgraded to 2.5 MB and 4 MB configurations using 150ns or faster 1 MB 30-pin SIMMs.Īpple warns against using composite SIMMs be sure to specify noncomposite SIMMs when buying memory for your Mac Plus. The Mac Plus shipped from the factory with 1 MB of system memory installed in the form of four 256 KB SIMMs.
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