> Message No Beep > IC to change > 74S175 at B1 > 74LS153 at C1 > 75S195 at C2 I have to argue this one. Keep it simple. It may be just a bad speaker. They were cheap speakers and I've seen a few that were blown out. Some bugs like the glue used in paper speakers. Vince -- Replica 1 the Apple 1 clone http://www.brielcomputers.com