Does anyone know where I can find the differences between the P80C51FA, FA1, and FA-1? I've looked everywhere. We have a 15 year old circuit board that exclusively used the FA and FA1 parts (that work fine). We bought a box of FA-1 for spares back in 2/2009 and just found out they don't power up the circuit boards at all. I was told they were the same some time ago, but I haven't found proof or disproof of that. I can't find any documentation from Intel or anywhere. I was going to order a last buy of these parts for the older systems before I convert to ARM, but obviously I don't want FA-1 if they don't work. Are they the same? I remember seeing that the '-' just got dropped. Maybe I got a bad batch. Any takers out there? Thanks in advance.