I've been working on getting a PDP-11/23 running for a while now, with various amounts of success! I had it in a state where I could boot XXDP from a virtual TU-58 and everything seemed to work pretty well. I then got ambitious and got an RL02 and an RLV11 (M8013+M8014), and last night I tried to get the RLV11 to pass the unconnected diagnostics that just test the controller. I tinkered with it for a while, but never got it to work. Then, in between trying a few things (but without touching the hardware), the machine seemed to get very flaky. Right now I can still boot an XXDP tape image, but as soon as I try to do anything it dumps me back to ODT: NOT ENOUGH MEMORY TO BOOT XXDP-XM BOOTING UP XXDP-SM SMALL MONITOR XXDP-SM SMALL MONITOR - XXDP V2.6 REVISION: E0 BOOTED FROM DD0 28KW OF MEMORY NON-UNIBUS SYSTEM RESTART ADDRESS: 152010 TYPE "H" FOR HELP . 150674 @ I tried removing the RLV11 boards, returning the machine to it's former state, but I have the same issue. I'm pretty new to all of this and always have trouble figuring out what the next debugging step should be. My machine is a PDP-11/23 with a H9273 backplane. I have, in this order Any help would be appreciated! Thanks! -- Ben Sinclair ben at bensinclair.com