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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)