Whenever you're trying to troubleshoot anything,
always verify the power=
=20
supplies first! I forget that myself from time to time, and have regret=
ted=20
doing so.
I'll second that!. And watch out for the power supply that's marginal.
I've had machine run fine for half an hour and then fall over in
'interesting ways'. Afgter spending a lot of time doing battle with the
logic, I finally find that the +5V line is sitting at 4.4V or something
like that.
-tony