Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Make Code Segment Read-Only
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  Syntax:   OPTION READONLY
 
            OPTION NOREADONLY
 
  See also: SEGMENT, .CODE
 
  Description:
 
     The READONLY option sets the READONLY attribute for subsequent code
     segments. Enables checking for instructions that explicitly modify
     segments or groups containing code. Useful for detecting self-
     modifying code. NOREADONLY is the default.
 
     This option replaces the command-line /P option from previous
     versions of the assembler. Segments can be also be made read-
     only with the READONLY parameter of the SEGMENT directive.
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