is a special file that is an image of the main memory
It may be used, for example, to examine
(and even to patch) the system.
are interpreted as physical memory addresses.
References to non-existent locations cause errors to be returned.
Examining and patching device registers is likely
to lead to unexpected results when read-only or write-only
except that kernel virtual memory
rather than physical memory is accessed.
begins at location 0160000 of
and per-process data for the current process
On VAX11's the I/O space begins at physical address 20000000(16)
and per-process data for the current process is at virtual 80020000(16).
On PDP11's and VAX11's, memory files are accessed one byte
at a time, an inapproriate method for some