LISP Interpreter

A (barely functional) LISP-1 interpreter for SmileBASIC. This is the final version using D. Menezes' QBASIC LISP interpreter. Next version will be an adaption of Sussman / Steele's SCHEME interpreter adapted to the existing "big heap" pseudo-VM. Sample LISP code with some functions: XKA84J4F Version history: http://andrew.uni.cx/smilebasic.html

=> (DEFINE FACT (LAMBDA (N)
    (DEFINE REC (LAMBDA (N ACC)
     (IF (ZERO? N) ACC
      (REC (+ N -1) (* N ACC)))))
    (REC N 1)))
'()
=> (FACT 5)
120
=>