Memory Information
	RAM Speed SIMM type On Board RAM Number of SIMM Slots Supported sizes in MB Maximum RAM Virtual Memory On Board VRAM Number of VRAM slots	100ns 30 pin 1MB 4 .256, .512, 1, 2, 4 17MB 1GB none none

Notes

The Macintosh IIsi has 1MB soldered to the logic board, you must fill all four SIMM slots when expanding memory.

32-BIT Information

This system has 32-bit-clean ROMs allowing it to take advantage of more than 8MB of physical RAM under System 7 by enabling 32 bit addressing in the Memory Control Panel.