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Apple Macintosh Performa 640CD DOS Compatible Memory

System Memory
Standard Memory: 4 MB (removable) 4MB non-removable + 4 MB (removable) on DOS card
Maximum Memory: 52 MB on system board / 32 MB on DOS card
Expansion Sockets: 2 sockets system board / 1 socket DOS card
Memory Comments: This system supports the Apple DOS card. The maximum memory for the DOS card is 32MB, and has one socket. You may install standard 72pin non-parity SIMMs, 4mb, 8mb, 16mb and 32mb modules.
System Specifications
Processor: 66/33MHz Motorola 68LC040
These memory upgrades are all guaranteed to work with
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