I found a box with a load I got with a bunch of so called Mac trash. All bags marked non working no boot. On a whim I took a power supply from a 6100 and plugged it into a board marked 660av and bong it starts to blinking floppy. So there is a quadra 840av board also if I can find a power supply for it I may have to hack some old G3 enclosure to make them working macs again.