The maximum virtual memory size setting is about 999 MB assuming that this much hard disk space is available. The exact maximum setting depends on the version of Mac OS 8 or 9 you are using. If more than 1 GB of memory is installed, the Memory control panel states:
"This computer has more than 996 MB of RAM installed. Virtual Memory can only be turned on when less than this amount of RAM is installed."
Note: The exact limit shown depends on the version of Mac OS 8 or 9 you are using.
Some of the memory is reserved for file mapping code fragments, and some is reserved for other system use.
Note: The maximum amount of virtual memory available on your computer is limited by available space on your hard disk. You cannot make a virtual memory setting that is larger than the amount of free hard disk space.