Contents of Decrement part of Register

<programming> (cdr) /ku'dr/ or /kuh'dr/ The LISP operation that returns the right-hand node of a binary tree structure. In the typical case where the tree is used to store a list, the cdr is the tail of the list, i.e. all but the first element.

The instruction format of the IBM 7090 that hosted the original LISP implementation featured two 15-bit fields called the "address" and "decrement" parts. The term "cdr" was originally "Contents of Decrement part of Register". Similarly, "car" stood for "Contents of Address part of Register".

[Jargon File]

Last updated: 2007-02-28

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Content Data Model « content-free « contention slot « Contents of Decrement part of Register » context » context clash » COntext Dependent Information Language