>circuits, it might cause problems, but I have been an electronics hobbist
>in earnest for about 6 years, have played with lots of chips from many
>logic families, and I have never had any problem with a circuit that was
>cured by tieing an unused input! Have I just had good luck? Or, is this
>similar to other's experience as well?

I have had a 68HC11 that this was exactly the problem.  Pullups on the unused po
rts fixed it.

--
Richard A. Smith                         Bitworks, Inc.
rsmith@bitworks.com               501.521.3908
Sr. Design Engineer        http://www.bitworks.com