strange macro "or" behavior in CormanLisp2.01

Hi, Corman Lisp Gurus,

I've noticed the following when I was doing a excercise in 
Paul Graham's ANSI Common Lisp:

[Corman Common Lisp 2.01]
(or 13 (/ 1 0))
;;; An error occurred in function /:
;;; Error: Divide by zero error: 1 / 0
----snip----

[Allegro Common Lisp 6.2]
CL-USER(1): (or 13 (/ 1 0))
13
CL-USER(2):

Macro OR should evaluate each form, one at a time, from left to right.
I think that Corman Lisp generates bad result.

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