Specifications

Memory Guide Early Macintosh - 5
Macintosh Classic
The Macintosh Classic comes
with 1 MB of soldered DRAM.
The memory expansion card
has 1 MB soldered on and two
SIMM slots. Using two 1 MB
SIMMs, a maximum of 4 MB
is possible.
Note: Be sure to configure
the jumper as shown when
memory is added to the card.
Note: The Macintosh Classic can perform
erratically if 1MB SIMMs containing two
chips are installed. When installing
memory, be sure to use 8 chip SIMMs.
Memory Information
DRAM Speed 150 ns
SIMM Type 30-pin
Soldered DRAM 1 MB
Number of SIMM Slots 2
Supported Sizes in MB 256K, 1
Maximum DRAM 4 MB
Virtual Memory No
Soldered VRAM None
Number of VRAM Slots None
DRAM Configurations
1 MB The Classic logic board has1 MB
of soldered DRAM.
2 MB • Install a Classic Memory
Expansion Board with no
SIMMs installed.
• Install the jumper in the
“Without SIMMs Installed”
position.
2.5 MB • Install a Classic Memory
Expansion Board with two
256K SIMMs installed. Use
120 ns or faster 30-pin
SIMMs.
• Install the jumper in the
“With SIMMs Installed”
position.
4 MB • Install a Classic Memory
Expansion Board with two 1
MB SIMMs installed.
• Install the jumper in the
“With SIMMs Installed”
position.