XPost: comp.lang.lisp, alt.usage.english   
   From: nmh@sraddha.invalid   
      
   In comp.lang.lisp Aidan Kehoe  wrote:   
   > ?Contents of the decrement register,? wasn?t it? Not horrific on that front.   
      
   Content of the Decrement part of a Register. Some instructions on the   
   704 divided 36-bit words into four parts: prefix, decrement, tag, and   
   address:   
      
   -3-|-------15------|-3-|-------15------   
   PPP DDDDDDDDDDDDDDD TTT AAAAAAAAAAAAAAA   
      
   CAR and CDR extracted the D(ecrement) and A(ddress) parts. Because the   
   machine had 15 address lines, a CONS could be stored in a single machine   
   word. Personally, I like the names CAR and CDR and how they extend, e.g.   
   CADR, CDDR, etc.   
      
   --   
   Nils M Holm  < n m h @ t 3 x . o r g >  http://t3x.org   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)