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Date: Fri, 13 May 88 12:17:38 PDT
From: Jim McDonald <email@example.com>
Guy, is that a trick bet?
No, just goofing around.
The CDC 6500 had a lisp (UTEXAS?) with CAR, CDR, and CZR slots for the
three 18-bit addresses in their 60-bit words. However, if I remember
correctly, you would technically win your bet, since there still
wasn't a three-slot cons. You had to do something like:
(SETQ CELL (CONS A B))
(RPLACZ CELL C)
One of the earliest Lisp systems, when it was still just
a set of Fortran subroutines, had a four-slot cons.
"Therefore, ... car ... and its analogs cdr, cpr, and ctr
were defined. At some point a cons(a, d, p, t) was defined,
but it was regarded as a subroutine and not as a function
with a value."
--John McCarthy, "History of Lisp"
in Wexelblat, Richard L. (ed.) History of Programming Languages.
Academic Press, New York (1981), p. 175.
- From: Jim McDonald <firstname.lastname@example.org>