(load "digital-circuits.txt")

; Copied from digital-circuits.txt
(define (logical-or a b)
  (cond ((= a 1) 1)
        ((= b 1) 1)
        (else 0)))

(define or-gate-delay 5)

(define (or-gate a1 a2 output)
  (define (or-action-procedure)
    (let ((new-value (logical-or (get-signal a1) (get-signal a2))))
      (after-delay or-gate-delay
                   (lambda () (set-signal! output new-value)))))
  (add-action! a1 or-action-procedure)
  (add-action! a2 or-action-procedure)
  'ok)