NAME
mem, kmem, null - core memory
DESCRIPTION
Mem is a special file that is an image of the core memory of
the computer. It may be used, for example, to examine, and
even to patch the system using the debugger.
A memory address is an 18-bit quantity which is used
directly as a UNIBUS address. 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 bits are
present.
The file kmem is the same as mem except that kernel virtual
memory rather than physical memory is accessed. In particu-
lar, the I/O area of kmem is located beginning at 160000
(octal) rather than at 760000. The 1K region beginning at
140000 (octal) is the system's data for the current process.
The file null returns end-of-file on read and ignores write.
FILES
/dev/mem, /dev/kmem, /dev/null
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