PC-LISP
PC-LISP is an implementation of the Franz Lisp dialect by Peter Ashwood-Smith.
Version 2.07 was released on 1 February 1986, and version 3.00 was released on 1 February 1990. A current version is available through GitHub.
Currently, PC-LISP runs under 32 & 64 bit versions of Linux, Mac, Windows, and NetBSD. For NetBSD there also exists ports for AArch64, ARMv5/6/7, PowerPC, Motorola 68000, SPARC/SPARC64, Alpha and VAX.
Note that the Franz LISP dialect was the immediate, portable successor to the ITS version of Maclisp and is perhaps the closest thing to the LISP in the Steven Levy book Hackers as is practical to operate.
PC-LISP is written primarily in the C programming language, with some parts now also written in Common Lisp. Because PC-LISP implements Franz LISP, it is a dynamically scoped predecessor to modern Common Lisp.
Example
The session is running the following code which demonstrates dynamic scoping in Franz LISP. Note that PC-LISP does not implement thelet special form that Emacs Lisp provides for local variables. Instead, all variables are what an ALGOL-based language would call "global". The first dialect of Lisp to incorporate ALGOL scoping rules was Scheme although the Common Lisp language also added this feature.;; Demonstration of dynamic scoping
;; This is a "global" variable
;; Another global variable
;; a function which prints the symbols
)
;; override the symbols
)
;; define two symbols
;; print them
)
Another example showing the use of backquote and the power of LISP. This is a differentiation example.
; D -
; Will compute the symbolic derivative of expression e with respect
; to variable X. We take the expression in standard lisp prefix form and will
; use the following rules of differentiation.
; D = 1
; D = 0
; D = D/u
; D = D+D
; D = D-D
; D = D*v + u*D
; D = D*v + /v^2
; D = */v + D*ln)
v )
,))
,))
)
)))
))))
]