You can’t start an application program or it quits unexpectedly. Or, when you try to open a program, you see a message that not enough memory is available.

One of the following is probably the cause:

mThe Macintosh ran out of memory.

Quit the programs that you have open and then open the program you want to use, or restart your Macintosh.

Use the Memory control panel to turn on virtual memory. For more

information on virtual memory, see the “Memory” topic of Macintosh Guide, available in the Guide (h) menu.

mThe program needs more memory.

Use the program’s Info window to give it more memory. For more

information on increasing a program’s memory, see the “Memory” topic of Macintosh Guide, available in the Guide (h) menu.

mThe program is incompatible with your Macintosh.

Contact the program’s publisher to see if there is an upgrade available for the program.

You see a message that you need to have an FPU installed.

Your computer has a floating-point unit (FPU) installed. If you see this message, the program is probably incompatible with your Macintosh. Contact the program’s publisher to see if there is an upgrade available for the program.

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Apple 640 manual You see a message that you need to have an FPU installed