256M means real memory, you can't calculate virtual memory. Before Websphere access virtual memory, it'll use at least 200M real memory. No necessary to test. btw, my computer has 2sims each 256M. So i'm sorry I can't test for you.
(How are you?)
Can anybody tell me whether Websphere can run in less 128M Memory? I run it in my computer and got a "Error 2140: An internal windowsNT error occurred." message.TIA