I guess there must have been only one copy of the 11/53 CPU board manual left in the world, and Giorgio Ungarelli had it in Switzerland. He sent me a copy, and I will eventually get this information up on my web site. It is a supplement to the MicroPDP-11/73 manual. It documents the baud rate, boot, and halt option jumpers, etc. for the older version of the KDJ11-DA, the one with only .5 meg of RAM on board, and the CPU in the center. I've got one of these boards, and a couple of the newer ones (KDJ11-SD). I'm sure that once we know what the jumpers do, we can figure out where they got moved on the newer boards. I think the reason the board won't boot when you don't have a front panel is that the boot option inputs float to "15", which is "manufaturing test loop". -- Jonathan Engdahl Rockwell Automation Principal Research Engineer 24800 Tungsten Road Advanced Technology Euclid, OH 44117 USA Euclid Labs http://users.safeaccess.com/engdahl