as: Dot

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1 5.4 The Special Dot Symbol
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1 The special symbol '.' refers to the current address that 'as' is
1 assembling into.  Thus, the expression 'melvin: .long .' defines
1 'melvin' to contain its own address.  Assigning a value to '.' is
1 treated the same as a '.org' directive.  Thus, the expression '.=.+4' is
1 the same as saying '.space 4'.
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