Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Memory Model with .386/.486
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     If the .MODEL directive is preceded by the .386 or .486 directive
     (or their privileged counterparts), the assembler uses 32-bit
     segments. If the .386 or .486 directive follows the .MODEL
     directive, the default 16-bit segments are used. The flat memory
     model uses 32-bit segments and must be preceded by a .386 or .486
     directive.
 
     32-bit segments are available only on the 80386/486 processors.
 
     See also: .386, .486, OPTION SEGMENT:
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