Apple Desktop Computer Bedienungsanleitung PDF herunterladen (Seite 52)

CHAPTER 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. ▲

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

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 75 76

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Apple Desktop Computer Bedienungsanleitung Seite 52