Specifications

Memory Guide Early Macintosh - 11
Macintosh IIx
The Macintosh IIx originally
shipped in a number of
configurations. Both systems
require PAL type SIMMs in
densities higher than 1 MB.
Verify with your memory
vendor that the SIMMs are
compatible with the IIx.
You must fill an entire bank
of four SIMMs when
upgrading memory.
Memory Information
DRAM Speed 120 ns
SIMM Type 30-pin
Soldered DRAM None
Number of SIMM Slots 8
Supported Sizes in MB 256K, 1, 4, 16
Maximum DRAM 128 MB
Virtual Memory 1 GB (with
MODE32 7.5
installed)
Soldered VRAM None
Number of VRAM Slots None
Note: You must fill an entire bank of four
SIMMs when upgrading memory.
DRAM Configurations
Total
Memory Bank A Bank B
1 MB Four 256K Empty
2 MB Four 256K Four 256K
4 MB Four 1 MB Empty
5 MB Four 1 MB Four 256K
8 MB Four 1 MB Four 1 MB
16 MB Four 4 MB Empty
17 MB Four 4 MB Four 256K
20 MB Four 4 MB Four 1 MB
32 MB Four 4 MB Four 4 MB