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aos


aos

 

  2  definitions  found 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  AOS 
 
  1.  /aws/  (East  Coast),  /ay-os/  (West  Coast)  A 
  {PDP-10}  instruction  that  took  any  memory  location  and  added  1 
  to  it  AOS  meant  "Add  One  and  do  not  Skip".  Why,  you  may 
  ask  does  the  S"  stand  for  "do  not  Skip"  rather  than  for 
  "Skip"?  Ah  here  was  a  beloved  piece  of  PDP-10  folklore. 
  There  were  eight  such  instructions:  AOSE  added  1  and  then 
  skipped  the  next  instruction  if  the  result  was  Equal  to  zero; 
  AOSG  added  1  and  then  skipped  if  the  result  was  Greater  than 
  0;  AOSN  added  1  and  then  skipped  if  the  result  was  Not  0;  AOSA 
  added  1  and  then  skipped  Always  and  so  on  Just  plain  AOS 
  didn't  say  when  to  skip,  so  it  never  skipped. 
 
  For  similar  reasons,  AOJ  meant  "Add  One  and  do  not  Jump". 
  Even  more  bizarre,  SKIP  meant  "do  not  SKIP"!  If  you  wanted  to 
  skip  the  next  instruction,  you  had  to  say  "SKIPA".  Likewise, 
  JUMP  meant  "do  not  JUMP";  the  unconditional  form  was  JUMPA. 
  However,  hackers  never  did  this  By  some  quirk  of  the  10's 
  design,  the  {JRST}  (Jump  and  ReSTore  flag  with  no  flag 
  specified)  was  actually  faster  and  so  was  invariably  used 
  Such  were  the  perverse  mysteries  of  assembler  programming. 
 
  2.  /A-O-S/  or  /A-os/  A  {Multics}-derived  {operating  system} 
  supported  at  one  time  by  {Data  General}. 
 
  A  spoof  of  the  standard  AOS  system  administrator's  manual 
  ("How  to  Load  and  Generate  your  AOS  System")  was  created, 
  issued  a  part  number,  and  circulated  as  photocopy  folklore;  it 
  was  called  "How  to  Goad  and  Levitate  your  CHAOS  System". 
 
  3.  Algebraic  Operating  System,  in  reference  to  those 
  calculators  which  use  {infix}  instead  of  {postfix}  (reverse 
  Polish)  notation. 
 
  [{Jargon  File}] 
 
  (1995-11-26) 
 
 
 
  From  V.E.R.A.  --  Virtual  Entity  of  Relevant  Acronyms  13  March  2001  [vera]: 
 
  AOS 
  Algebraic  Operating  System  (IBM)