The single question marks are non-fatal errors and the double question marks
are fatal errors.
It runs OpenVMS fine despite the fatal memory errors.
In this context, non-fatal selftest errors are ones which still allow the
machine to automatically boot at power on, assuming it is configured to.
Fatal errors are ones which prevent the automatic boot sequence from completing
and leave you at the >>> prompt. You can still decide to ignore the errors
and boot manually. The fatal errors are more of a "you really should know
about these problems before you attempt to boot" rather than "booting will
definately not work".
Regards,
Peter Coghlan.