資料來源 : pyDict

點點通,[地球村互聯網絡詞典的簡稱,是閱讀英文電子資料必備的輔助工具]

資料來源 : WordNet®

DDT
     n : an insecticide that is also toxic to animals and humans;
         banned in the United States since 1972 [syn: {dichlorodiphenyltrichloroethane}]

資料來源 : Free On-Line Dictionary of Computing

DDT
     
        1. Generic term for a program that assists in debugging other
        programs by showing individual machine instructions in a
        readable symbolic form and letting the user change them.  In
        this sense the term DDT is now archaic, having been widely
        displaced by "debugger" or names of individual programs like
        "{adb}", "{sdb}", "{dbx}", or "{gdb}".
     
        2. Under {MIT}'s fabled {ITS} {operating system}, DDT (running
        under the alias HACTRN) was also used as the {shell} or top
        level command language used to execute other programs.
     
        3. Any one of several specific debuggers supported on early
        {DEC} hardware.  The {DEC} {PDP-10} Reference Handbook (1969)
        contained a footnote on the first page of the documentation
        for DDT that illuminates the origin of the term:
     
        Historical footnote: DDT was developed at {MIT} for the
        {PDP-1} computer in 1961.  At that time DDT stood for "DEC
        Debugging Tape".  Since then, the idea of an on-line debugging
        program has propagated throughout the computer industry.  DDT
        programs are now available for all DEC computers.  Since media
        other than tape are now frequently used, the more descriptive
        name "Dynamic Debugging Technique" has been adopted, retaining
        the DDT abbreviation.  Confusion between DDT-10 and another
        well known pesticide, dichloro-diphenyl-trichloroethane
        (C14-H9-Cl5) should be minimal since each attacks a different,
        and apparently mutually exclusive, class of bugs.
     
        (The "tape" referred to was, incidentally, not magnetic but
        paper.)  Sadly, this quotation was removed from later editions
        of the handbook after the {suit}s took over and DEC became
        much more "businesslike".
     
        The history above is known to many old-time hackers.  But
        there's more: Peter Samson, compiler of the original {TMRC}
        lexicon, reports that he named "DDT" after a similar tool on
        the {TX-0} computer, the direct ancestor of the PDP-1 built at
        {MIT}'s Lincoln Lab in 1957.  The debugger on that
        ground-breaking machine (the first transistorised computer)
        rejoiced in the name FLIT (FLexowriter Interrogation Tape).
     
        [{Jargon File}]