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ddt

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ddt


  3  definitions  found 
 
  From  Jargon  File  (4.2.3,  23  NOV  2000)  [jargon]: 
 
  DDT  /D-D-T/  n.  [from  the  insecticide 
  para-dichloro-diphenyl-trichloroethene]  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.  [ITS]  Under  MIT's  fabled  {{ITS}}  operating  system,  DDT 
  (running  under  the  alias  HACTRN  a  six-letterism  for  `Hack  Translator') 
  was  also  used  as  the  {shell}  or  top  level  command  language  used  to  execute 
  other  programs.  3.  Any  one  of  several  specific  DDTs  (sense  1)  supported 
  on  early  {DEC}  hardware  and  CP/M.  The  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  transistorized  computer) 
  rejoiced  in  the  name  FLIT  (FLexowriter  Interrogation  Tape). 
 
 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  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}] 
 
 
 
  From  V.E.R.A.  --  Virtual  Entity  of  Relevant  Acronyms  13  March  2001  [vera]: 
 
  DDT 
  Dynamic  Debugging  Tool  (DEC) 
 
 




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