Hi, the enthusiasm to get more than 8MB simms made me forget that the different decstations do not all use the same memory. However I found a ressource of partnumbers: "http://www.ktec.com.au/", they have MS15-EA (probably 3000/300) and MS44-DA (VAXstation 4000 60). And the subject should have been "16MB Simm on 5000/240". Thank you all mike