It would not have the feel or sounds of an EM (that make it for me at least)
without score reels or bells and Chimes or the ka-chunk ka-chink of the countdown bonus
or the ratatattat of score reels resetting.
What logic powers the game, could be either a mpu or contact & relay stacks.
Herb's KoD score reels lacked the feel and true sounds of the score reels resetting,
though I think I remember them trying to reproduce those sounds electronically
but it was hollow.