Apple iMac - Manual (Page 52)

C H A P T E R 4
RAM Expansion
52 Main RAM Expansion
Address Multiplexing 4
Signals A[0] – A[13] on each RAM SO-DIMM make up a 14-bit multiplexed
address bus that can support several different types of SDRAM devices. Table
4-2 lists the types of devices that can be used in the iMac computer by size,
configuration, and sizes of row and column addresses.
IMPORTANT
The iMac supports only the types of SDRAM devices
specified in Table 4-2. Other types of DRAM devices should
not be used with this computer.
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RAM SO-DIMM Electrical Limits 4
Each RAM SO-DIMM must not exceed the following maximum current limits
on the +3 V supply:
Table 4-2 Types of DRAM devices
Device size
Device
configuration
Size of
row
address Size of
column
address
16 Mbits 2M x 4 x 2 11 10
16 Mbits 1M x 8 x 2 11 9
16 Mbits 512K x 16 x 2 11 8
64 Mbits 8M x 4 x 2 13 10
64 Mbits 4M x 4 x 4 12 10
64 Mbits 4M x 8 x 2 13 9
64 Mbits 2M x 8 x 4 12 9
64 Mbits 2M x 16 x 2 13 8
64 Mbits 1M x 16 x 4 12 8
64 Mbits 1M x 32 x 2 13 7
64 Mbits 512K x 32 x 4 12 7