A Classic II could be upgraded all the way to 10MB using 4MB Simms in its two RAM slots. Built-in doesn't just mean soldered in (the Classic II has 2MB on the logic board), but means total physical RAM. RAM Doubler is an excellent virtual memory program. My experience with it is that at 2x it is marvellous, but any greater factor slows it down enormously. There was a version for Windows, but I don't know that it ever caught on.

Ken