Specifications

Memory Guide Early Macintosh - 15
Macintosh IIsi
The Macintosh IIsi has 1 MB
soldered to the logic board and
is expandable to 17 MB
(Bank A).
You must fill all four SIMM
slots in Bank B when
expanding memory.
Memory Information
DRAM Speed 100 ns
SIMM Type 30-pin
Soldered DRAM 1 MB
Number of SIMM Slots 4
Supported Sizes in MB 256K, 512K, 1,
2, 4
Maximum DRAM 17 MB
Virtual Memory 1 GB
Soldered VRAM None
Number of VRAM Slots None
DRAM Configurations
Total
Memory
Bank A
(soldered) Bank B
2 MB 1 MB Four 256K
3 MB 1 MB Four 512K
5 MB 1 MB Four 1 MB
9 MB 1 MB Four 2 MB
17 MB 1 MB Four 4 MB