Folks,
I have an Apple II that produces one beep at power on, but my monitor says "no video present". A scope on the output shows frame sync but at low levels. The odd thing is that ic A9 appears to be a 74S151 not a 74LS151. I wouldn't expect this to work, but I assume it was working at some point in time! I have done some googling and can't see any reference to this substitution. Is it something any one else has seen? Dave Wade
