DDT
1. G en eric t erm for a program that assists in d ebugging oth er programs by showing individual machin e instructions in a r eadabl e symbolic form and l etting th e us er chang e th em. In this s ens e th e t erm DDT is now archaic, having b een wid ely displac ed by "d ebugg er" or nam es of individual programs lik e " ef="module.php?name=Lexikon&file=search&eid=1&query=adb">adb", " ef="module.php?name=Lexikon&file=search&eid=1&query=sdb">sdb", " ef="module.php?name=Lexikon&file=search&eid=1&query=dbx">dbx", or " ef="module.php?name=Lexikon&file=search&eid=1&query=gdb">gdb". 2. Und er ef="module.php?name=Lexikon&file=search&eid=1&query=MIT">MIT' s fabl ed ef="module.php?name=Lexikon&file=search&eid=1&query=ITS">ITS ef="module.php?name=Lexikon&file=search&eid=1&query=operating system">operating system, DDT (running und er th e alias HACTRN) was also us ed as th e ef="module.php?name=Lexikon&file=search&eid=1&query=shell">shell or top l ev el command languag e us ed to ex ecut e oth er programs. 3. Any on e of s ev eral sp ecific d ebugg ers support ed on early ef="module.php?name=Lexikon&file=search&eid=1&query=DeC">DeC hardwar e. Th e ef="module.php?name=Lexikon&file=search&eid=1&query=DeC">DeC ef="module.php?name=Lexikon&file=search&eid=1&query=PDP-10">PDP-10 R ef er enc e Handbook (1969) contain ed a footnot e on th e first pag e of th e docum entation for DDT that illuminat es th e origin of th e t erm: Historical footnot e: DDT was d ev elop ed at ef="module.php?name=Lexikon&file=search&eid=1&query=MIT">MIT for th e ef="module.php?name=Lexikon&file=search&eid=1&query=PDP-1">PDP-1 comput er in 1961. At that tim e DDT stood for "D eC D ebugging Tap e". Sinc e th en, th e id ea of an on-lin e d ebugging program has propagat ed throughout th e comput er industry. DDT programs ar e now availabl e for all D eC comput ers. Sinc e m edia oth er than tap e ar e now fr equ ently us ed, th e mor e d escriptiv e nam e "Dynamic D ebugging T echniqu e" has b een adopt ed, r etaining th e DDT abbr eviation. Confusion b etw een DDT-10 and anoth er w ell known p esticid e, dichloro-diph enyl-trichloro ethan e (C14-H9-Cl5) should b e minimal sinc e each attacks a diff er ent, and appar ently mutually exclusiv e, class of bugs. (Th e "tap e" r ef err ed to was, incid entally, not magn etic but pap er.) Sadly, this quotation was r emov ed from lat er editions of th e handbook aft er th e ef="module.php?name=Lexikon&file=search&eid=1&query=suit">suits took ov er and D eC b ecam e much mor e "busin esslik e". Th e history abov e is known to many old-tim e hack ers. But th er e' s mor e: P et er Samson, compil er of th e original ef="module.php?name=Lexikon&file=search&eid=1&query=TMRC">TMRC l exicon, r eports that h e nam ed "DDT" aft er a similar tool on th e ef="module.php?name=Lexikon&file=search&eid=1&query=TX-0">TX-0 comput er, th e dir ect anc estor of th e PDP-1 built at ef="module.php?name=Lexikon&file=search&eid=1&query=MIT">MIT' s Lincoln Lab in 1957. Th e d ebugg er on that ground-br eaking machin e (th e first transistoris ed comput er) r ejoic ed in th e nam e FLIT (FL exowrit er Int errogation Tap e). [ ef="module.php?name=Lexikon&file=search&eid=1&query=Jargon File">Jargon File] e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents: [ ef="module.php?name=Lexikon&op=content&tid=31">2 ] [ ef="module.php?name=Lexikon&op=content&tid=134">= ] [ ef="module.php?name=Lexikon&op=content&tid=154">abbrev ] [ ef="module.php?name=Lexikon&op=content&tid=234">ACT ] [ ef="module.php?name=Lexikon&op=content&tid=262">ad ] [ ef="module.php?name=Lexikon&op=content&tid=383">af ] [ ef="module.php?name=Lexikon&op=content&tid=396">ag ] [ ef="module.php?name=Lexikon&op=content&tid=411">ai ] [ ef="module.php?name=Lexikon&op=content&tid=433">al ] [ ef="module.php?name=Lexikon&op=content&tid=544">am ] [ ef="module.php?name=Lexikon&op=content&tid=592">an ] [ ef="module.php?name=Lexikon&op=content&tid=683">app ] [ ef="module.php?name=Lexikon&op=content&tid=740">ar ] [ ef="module.php?name=Lexikon&op=content&tid=743">arc ] [ ef="module.php?name=Lexikon&op=content&tid=759">arg ] [ ef="module.php?name=Lexikon&op=content&tid=800">as ] [ ef="module.php?name=Lexikon&op=content&tid=894">at ] [ ef="module.php?name=Lexikon&op=content&tid=996">av ] [ ef="module.php?name=Lexikon&op=content&tid=1025">B ] [ ef="module.php?name=Lexikon&op=content&tid=1026">b ] [ ef="module.php?name=Lexikon&op=content&tid=1159">bb ] [ ef="module.php?name=Lexikon&op=content&tid=1181">be ] [ ef="module.php?name=Lexikon&op=content&tid=1444">bo ] [ ef="module.php?name=Lexikon&op=content&tid=1535">br ] [ ef="module.php?name=Lexikon&op=content&tid=1562">break ] [ ef="module.php?name=Lexikon&op=content&tid=1672">bus ] [ ef="module.php?name=Lexikon&op=content&tid=1695">by ] [ ef="module.php?name=Lexikon&op=content&tid=1708">C ] [ ef="module.php?name=Lexikon&op=content&tid=1724">ca ] [ ef="module.php?name=Lexikon&op=content&tid=2001">ch ] [ ef="module.php?name=Lexikon&op=content&tid=2099">ci ] [ ef="module.php?name=Lexikon&op=content&tid=2136">ck ] [ ef="module.php?name=Lexikon&op=content&tid=2138">cl ] [ ef="module.php?name=Lexikon&op=content&tid=2145">class ] [ ef="module.php?name=Lexikon&op=content&tid=2247">co ] [ ef="module.php?name=Lexikon&op=content&tid=2330">com ] [ ef="module.php?name=Lexikon&op=content&tid=2342">comma ] [ ef="module.php?name=Lexikon&op=content&tid=2343">command ] [ ef="module.php?name=Lexikon&op=content&tid=2429">compiler ] [ ef="module.php?name=Lexikon&op=content&tid=2491">computer ] [ ef="module.php?name=Lexikon&op=content&tid=2545">con ] [ ef="module.php?name=Lexikon&op=content&tid=2791">cr ] [ ef="module.php?name=Lexikon&op=content&tid=2888">CT ] [ ef="module.php?name=Lexikon&op=content&tid=2900">cu ] [ ef="module.php?name=Lexikon&op=content&tid=2976">D ] [ ef="module.php?name=Lexikon&op=content&tid=3135">DD ] [ ef="module.php?name=Lexikon&op=content&tid=3151">de ] [ ef="module.php?name=Lexikon&op=content&tid=3165">deb ] [ ef="module.php?name=Lexikon&op=content&tid=3175">debugging ] [ ef="module.php?name=Lexikon&op=content&tid=3176">DeC ] [ ef="module.php?name=Lexikon&op=content&tid=3371">diff ] [ ef="module.php?name=Lexikon&op=content&tid=3565">do ] [ ef="module.php?name=Lexikon&op=content&tid=3568">doc ] [ ef="module.php?name=Lexikon&op=content&tid=3573">document ] [ ef="module.php?name=Lexikon&op=content&tid=3574">documentation ] [ ef="module.php?name=Lexikon&op=content&tid=3657">DP ] [ ef="module.php?name=Lexikon&op=content&tid=3752">du ] [ ef="module.php?name=Lexikon&op=content&tid=3754">dual ] [ ef="module.php?name=Lexikon&op=content&tid=3834">e ] [ ef="module.php?name=Lexikon&op=content&tid=3865">ec ] [ ef="module.php?name=Lexikon&op=content&tid=3896">ed ] [ ef="module.php?name=Lexikon&op=content&tid=3929">ee ] [ ef="module.php?name=Lexikon&op=content&tid=4148">er ] [ ef="module.php?name=Lexikon&op=content&tid=4150">era ] [ ef="module.php?name=Lexikon&op=content&tid=4171">es ] [ ef="module.php?name=Lexikon&op=content&tid=4199">et ] [ ef="module.php?name=Lexikon&op=content&tid=4273">excl ] [ ef="module.php?name=Lexikon&op=content&tid=4279">exec ] [ ef="module.php?name=Lexikon&op=content&tid=4284">execute ] [ ef="module.php?name=Lexikon&op=content&tid=4497">fi ] [ ef="module.php?name=Lexikon&op=content&tid=4520">file ] [ ef="module.php?name=Lexikon&op=content&tid=4606">FL ] [ ef="module.php?name=Lexikon&op=content&tid=4646">FLI ] [ ef="module.php?name=Lexikon&op=content&tid=4700">fo ] [ ef="module.php?name=Lexikon&op=content&tid=4727">for ] [ ef="module.php?name=Lexikon&op=content&tid=4828">fr ] [ ef="module.php?name=Lexikon&op=content&tid=4967">fusion ] [ ef="module.php?name=Lexikon&op=content&tid=4983">G ] [ ef="module.php?name=Lexikon&op=content&tid=4989">ga ] [ ef="module.php?name=Lexikon&op=content&tid=5026">gate ] [ ef="module.php?name=Lexikon&op=content&tid=5027">gated ] [ ef="module.php?name=Lexikon&op=content&tid=5049">gd ] [ ef="module.php?name=Lexikon&op=content&tid=5057">ge ] [ ef="module.php?name=Lexikon&op=content&tid=5134">gh ] [ ef="module.php?name=Lexikon&op=content&tid=5141">gi ] [ ef="module.php?name=Lexikon&op=content&tid=5205">gn ] [ ef="module.php?name=Lexikon&op=content&tid=5291">gr ] [ ef="module.php?name=Lexikon&op=content&tid=5390">gs ] [ ef="module.php?name=Lexikon&op=content&tid=5403">gu ] [ ef="module.php?name=Lexikon&op=content&tid=5434">h ] [ ef="module.php?name=Lexikon&op=content&tid=5438">hack ] [ ef="module.php?name=Lexikon&op=content&tid=5443">hacker ] [ ef="module.php?name=Lexikon&op=content&tid=5493">hang ] [ ef="module.php?name=Lexikon&op=content&tid=5512">hardware ] [ ef="module.php?name=Lexikon&op=content&tid=5540">hat ] [ ef="module.php?name=Lexikon&op=content&tid=5663">history ] [ ef="module.php?name=Lexikon&op=content&tid=5681">hn ] [ ef="module.php?name=Lexikon&op=content&tid=5768">hr ] [ ef="module.php?name=Lexikon&op=content&tid=5919">icon ] [ ef="module.php?name=Lexikon&op=content&tid=5931">id ] [ ef="module.php?name=Lexikon&op=content&tid=5986">iff ] [ ef="module.php?name=Lexikon&op=content&tid=6013">il ] [ ef="module.php?name=Lexikon&op=content&tid=6064">in ] [ ef="module.php?name=Lexikon&op=content&tid=6068">inc ] [ ef="module.php?name=Lexikon&op=content&tid=6413">io ] [ ef="module.php?name=Lexikon&op=content&tid=6446">iq ] [ ef="module.php?name=Lexikon&op=content&tid=6449">ir ] [ ef="module.php?name=Lexikon&op=content&tid=6482">is ] [ ef="module.php?name=Lexikon&op=content&tid=6557">IT ] [ ef="module.php?name=Lexikon&op=content&tid=6558">it ] [ ef="module.php?name=Lexikon&op=content&tid=6568">ITS ] [ ef="module.php?name=Lexikon&op=content&tid=6589">J ] [ ef="module.php?name=Lexikon&op=content&tid=6620">Jargon File ] [ ef="module.php?name=Lexikon&op=content&tid=6681">jo ] [ ef="module.php?name=Lexikon&op=content&tid=6789">ke ] [ ef="module.php?name=Lexikon&op=content&tid=6822">ki ] [ ef="module.php?name=Lexikon&op=content&tid=6861">kn ] [ ef="module.php?name=Lexikon&op=content&tid=6918">la ] [ ef="module.php?name=Lexikon&op=content&tid=6950">language ] [ ef="module.php?name=Lexikon&op=content&tid=7023">ld ] [ ef="module.php?name=Lexikon&op=content&tid=7091">Lex ] [ ef="module.php?name=Lexikon&op=content&tid=7107">li ] [ ef="module.php?name=Lexikon&op=content&tid=7146">Linc ] [ ef="module.php?name=Lexikon&op=content&tid=7151">line ] [ ef="module.php?name=Lexikon&op=content&tid=7399">ls ] [ ef="module.php?name=Lexikon&op=content&tid=7410">lt ] [ ef="module.php?name=Lexikon&op=content&tid=7415">lu ] [ ef="module.php?name=Lexikon&op=content&tid=7441">ly ] [ ef="module.php?name=Lexikon&op=content&tid=7457">M ] [ ef="module.php?name=Lexikon&op=content&tid=7463">ma ] [ ef="module.php?name=Lexikon&op=content&tid=7479">machine ] [ ef="module.php?name=Lexikon&op=content&tid=7582">man ] [ ef="module.php?name=Lexikon&op=content&tid=7932">mil ] [ ef="module.php?name=Lexikon&op=content&tid=7992">MIT ] [ ef="module.php?name=Lexikon&op=content&tid=8019">mm ] [ ef="module.php?name=Lexikon&op=content&tid=8032">mo ] [ ef="module.php?name=Lexikon&op=content&tid=8040">mod ] [ ef="module.php?name=Lexikon&op=content&tid=8079">module ] [ ef="module.php?name=Lexikon&op=content&tid=8167">mp ] [ ef="module.php?name=Lexikon&op=content&tid=8228">ms ] [ ef="module.php?name=Lexikon&op=content&tid=8258">mu ] [ ef="module.php?name=Lexikon&op=content&tid=8384">N ] [ ef="module.php?name=Lexikon&op=content&tid=8386">na ] [ ef="module.php?name=Lexikon&op=content&tid=8397">named ] [ ef="module.php?name=Lexikon&op=content&tid=8460">nc ] [ ef="module.php?name=Lexikon&op=content&tid=8472">ne ] [ ef="module.php?name=Lexikon&op=content&tid=8488">net ] [ ef="module.php?name=Lexikon&op=content&tid=8622">nf ] [ ef="module.php?name=Lexikon&op=content&tid=8627">ng ] [ ef="module.php?name=Lexikon&op=content&tid=8630">ni ] [ ef="module.php?name=Lexikon&op=content&tid=8672">nn ] [ ef="module.php?name=Lexikon&op=content&tid=8675">no ] [ ef="module.php?name=Lexikon&op=content&tid=8760">ns ] [ ef="module.php?name=Lexikon&op=content&tid=8964">om ] [ ef="module.php?name=Lexikon&op=content&tid=8988">on-line ] [ ef="module.php?name=Lexikon&op=content&tid=9014">op ] [ ef="module.php?name=Lexikon&op=content&tid=9061">operating system ] [ ef="module.php?name=Lexikon&op=content&tid=9204">pa ] [ ef="module.php?name=Lexikon&op=content&tid=9228">page ] [ ef="module.php?name=Lexikon&op=content&tid=9306">parent ] [ ef="module.php?name=Lexikon&op=content&tid=9430">PD ] [ ef="module.php?name=Lexikon&op=content&tid=9445">PDP ] [ ef="module.php?name=Lexikon&op=content&tid=9446">PDP-10 ] [ ef="module.php?name=Lexikon&op=content&tid=9457">pe ] [ ef="module.php?name=Lexikon&op=content&tid=9550">ph ] [ ef="module.php?name=Lexikon&op=content&tid=9651">pl ] [ ef="module.php?name=Lexikon&op=content&tid=9821">port ] [ ef="module.php?name=Lexikon&op=content&tid=9908">pr ] [ ef="module.php?name=Lexikon&op=content&tid=10023">program ] [ ef="module.php?name=Lexikon&op=content&tid=10144">pt ] [ ef="module.php?name=Lexikon&op=content&tid=10253">query ] [ ef="module.php?name=Lexikon&op=content&tid=10364">rc ] [ ef="module.php?name=Lexikon&op=content&tid=10385">re ] [ ef="module.php?name=Lexikon&op=content&tid=10754">rl ] [ ef="module.php?name=Lexikon&op=content&tid=10767">ro ] [ ef="module.php?name=Lexikon&op=content&tid=10887">ru ] [ ef="module.php?name=Lexikon&op=content&tid=10892">run ] [ ef="module.php?name=Lexikon&op=content&tid=10918">S ] [ ef="module.php?name=Lexikon&op=content&tid=11010">sc ] [ ef="module.php?name=Lexikon&op=content&tid=11102">script ] [ ef="module.php?name=Lexikon&op=content&tid=11128">sd ] [ ef="module.php?name=Lexikon&op=content&tid=11150">se ] [ ef="module.php?name=Lexikon&op=content&tid=11314">sh ] [ ef="module.php?name=Lexikon&op=content&tid=11339">shell ] [ ef="module.php?name=Lexikon&op=content&tid=11376">si ] [ ef="module.php?name=Lexikon&op=content&tid=11525">sl ] [ ef="module.php?name=Lexikon&op=content&tid=11651">so ] [ ef="module.php?name=Lexikon&op=content&tid=11790">spec ] [ ef="module.php?name=Lexikon&op=content&tid=11934">st ] [ ef="module.php?name=Lexikon&op=content&tid=12109">struct ] [ ef="module.php?name=Lexikon&op=content&tid=12133">su ] [ ef="module.php?name=Lexikon&op=content&tid=12162">suit ] [ ef="module.php?name=Lexikon&op=content&tid=12206">support ] [ ef="module.php?name=Lexikon&op=content&tid=12246">sy ] [ ef="module.php?name=Lexikon&op=content&tid=12312">system ] [ ef="module.php?name=Lexikon&op=content&tid=12359">T ] [ ef="module.php?name=Lexikon&op=content&tid=12409">tap ] [ ef="module.php?name=Lexikon&op=content&tid=12410">tape ] [ ef="module.php?name=Lexikon&op=content&tid=12588">th ] [ ef="module.php?name=Lexikon&op=content&tid=12707">TM ] [ ef="module.php?name=Lexikon&op=content&tid=12712">TMRC ] [ ef="module.php?name=Lexikon&op=content&tid=12715">tn ] [ ef="module.php?name=Lexikon&op=content&tid=12721">to ] [ ef="module.php?name=Lexikon&op=content&tid=12736">tool ] [ ef="module.php?name=Lexikon&op=content&tid=12787">tr ] [ ef="module.php?name=Lexikon&op=content&tid=12815">transistor ] [ ef="module.php?name=Lexikon&op=content&tid=12886">TS ] [ ef="module.php?name=Lexikon&op=content&tid=12896">tt ] [ ef="module.php?name=Lexikon&op=content&tid=12939">tw ] [ ef="module.php?name=Lexikon&op=content&tid=12965">TX-0 ] [ ef="module.php?name=Lexikon&op=content&tid=12986">ua ] [ ef="module.php?name=Lexikon&op=content&tid=13008">ug ] [ ef="module.php?name=Lexikon&op=content&tid=13030">um ] [ ef="module.php?name=Lexikon&op=content&tid=13146">up ] [ ef="module.php?name=Lexikon&op=content&tid=13175">us ] [ ef="module.php?name=Lexikon&op=content&tid=13188">user ] [ ef="module.php?name=Lexikon&op=content&tid=13252">va ] [ ef="module.php?name=Lexikon&op=content&tid=13310">ve ] [ ef="module.php?name=Lexikon&op=content&tid=13366">vi ] [ ef="module.php?name=Lexikon&op=content&tid=13725">win ] [ ef="module.php?name=Lexikon&op=content&tid=13864">write ] [ ef="module.php?name=Lexikon&op=content&tid=13891">X ]
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