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--- its_lisp [2020/04/15 21:07]
smj
+++ its_lisp [2022/05/23 03:10] (current)
ldbeth
@@ Line 2: / Line 2: @@
 The ITS Lisp is called Maclisp, or PDP-10 Maclisp if necessary to disambiguate it against [[Multics Maclisp]].  Its direct ancestor is [[its_pdp6_lisp|PDP-6 LISP]].
+The biggest difference between Multics Maclisp is PDP-10 version does not have "real" string data type, the PDP-10 Maclisp string is just a symbol with a special property been set. The good news is the ''format'' pretty printer function is still available to build strings with complex contents.
 **A sample MACLISP session on ITS using LEDIT MODE in EMACS**
-//LEDIT will work on both [[its_topics|ITS}} and [[TOPS-20]] ;tnx1.0e6 to GLS//
+//LEDIT will work on both [[its_topics|ITS]] and [[TOPS-20]] ;tnx1.0e6 to GLS//
       KA ITS 1648 DDT 1547 TTY 52               ;System herald
@@ Line 83: / Line 85: @@
      D                               ; 4. X = D
      E                               ; 5. X = E
-     NIL                             ; MACLISP reports NIL because the DO called PRINT X which returned NIL
+     NIL                             ; DO called PRINT X which returned NIL because there was nothing
+                                     ; left to PRINT in the list of "a b c d e"
+**MATH examples**
+     @maclisp
+     LISP 2122
+     Alloc? n
+     *
+     (+ 2 2)
+
+     (- 2 2)
+
+     (* 2 2)

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