The Apple IIGS requires 768K of memory to load all of the resources needed
for network operation and all of the operating system and to still have room
for applications. However, some users have reported running successfully
with just 512K of RAM.
If you're running with 512K of RAM, and no problems have surfaced, you have
been extremely lucky in the use of your networked Apple IIGS systems. The
512K configuration is not a supported environment for networked Apple IIGS
systems. Should difficulties occur in the future, immediately increase RAM
to 768K.