Address Space Definition/Meaning:
The number of distinct locations that may be referred to with the
machine address. For most (i.e. binary) machines it is equal to 2n, where n is
the number of bits in the machine address. In many large machines the address
space is larger than the number of physical or real addresses that are present
in the system. Additionally, the number of bits available to specify an address
is restricted (see instruction format), and some form of
address mapping or Addressing schemes is used to obtain the machine address from the specified
address.
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