Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!cs.utexas.edu!samsung!usc!ucsd!ucbvax!hplabs!hpfcso!hpldola!hp-lsd!dag
From: dag@hp-lsd.COS.HP.COM (David Geiser)
Newsgroups: sci.electronics
Subject: Re: Monitoring Digital Levels with an LED
Message-ID: <7600029@hp-lsd.COS.HP.COM>
Date: 1 Nov 89 19:36:16 GMT
References: <9640@june.cs.washington.edu>
Organization: HP Logic Systems Division - ColoSpgs, CO
Lines: 8

Quick and Dirty:

Let the outputs drive the base of a small transistor which will 
turn on the LED.  You might want to add a capacitor time delay
in the base circuit to slow down the rate at which the transitor
is turned off after it is turned on.  Otherwise, the pulses may
be too narrow to see.   Hmmm, looks like I've just described a
one-shot (retriggerable would be nice).