On 29.11.2010 2:20, Sampsa Laine wrote: I just increased the memory on one of my SIMH VAX VM's to 512 MB from 64 MB - the system boots fine but SHOW MEMORY (under OpenVMS 7.3-1) still reports 64 MB. Do I need to tell the VMS installation about the new RAM somehow? How much RAM does 7.3-1 (VAX) support anyway? Sampsa Try to replace ka655.bin firmware with the following file: http://pdp-11.org.ru/~form/files/ka655x.bin