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

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