osf1 man page for mem

mem(7)							 Miscellaneous Information Manual						    mem(7)

NAME
       mem - physical memory interface

DESCRIPTION
       The mem character special device file provides access to physical main memory.

       Byte addresses in mem are equivalent to physical memory in RAM. References to I/O space addresses or to nonexistent RAM will return errors.
       Write accesses to console or PAL memory will also return errors.

RESTRICTIONS
       Because memory is read and written in aligned quadwords (eight contiguous bytes), writing fewer than all the bytes in an  aligned  quadword
       is a read-modify-write operation that is not protected against concurrent writes to the same quadword.

FILES
       /dev/mem

RELATED INFORMATION
       kmem(7) delim off

																	    mem(7)