ByteRot :: Macintosh IIsi Ram Replacement

BYTEROT - retro PCs, consoles and lost software

Get an account

Accounts are free. Join #retro on irc.fxnet.org, identify with NickServ and type !req.

[ how ]

IRC

#retro on irc.fxnet.org
6697 ssl · 6667 plain
modern + vintage clients welcome

[ vintage how-to ]

Sections

OS 1,075

DRIVERS 61

SOFTWARE 22

GAMES 10

UTILS 37

DOCS 561

INCOMING 0

REQUESTS 0

LIBRARY 25,406 files

Some stats

releases	1,766
last 24h	+750
online	404.1 GB
library	1.2 TB
members	0
updated	2026-10-04 23:30

Macintosh IIsi Ram Replacement

Device	Macintosh IIsi
Difficulty	Moderate
Time	No estimate
Steps	4

This guide is by Chris Green on iFixit and is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0. ByteRot mirrors it for non-commercial preservation: formatting changed and photos resized for old browsers; full-size photos and the text are on the FTP in /DOCS/REPAIR. Original guide >>

The Macintosh IIsi uses 4 30-Pin RAM SIMMs, installed in pairs of two for a maximum capacity of 65MB (4X16MB + 1MB). It has 1MB of RAM soldered to the logic board.

Tools: Phillips #0 Screwdriver

Step 1

• Start by turning the computer around, and remove this #0 Phillips Screw.
• NOTE: There may or may not be a Phillips #0 screw here, depending on whether or not the computer has ever been serviced.

Step 2

• Now lift these two clips, and slowly pivot the case up.
• You can now seperate the top of the computer from the rest of the machine.

Step 3

• The IIsi uses 4 30-Pin SIMMs (Installed in pairs of 2) for a maximum ram capacity of 65MB. It has 1MB soldered to the logic board as well.
• Start with this SIMM. Push these 2 metal tabs outward, then push the ram forward. It can then be lifted out. You have to remove the SIMMs in order, starting with the one you just removed. You can then work your way through all of them.

Step 4

• 1st Photo: The RAM Module

Conclusion

To reassemble your device, follow these instructions in reverse order.

Credit