...or rather, sidestepped. I asked about this issue yesterday in case anyone had a quick "problem X can definitely cause that" response, before diving in with XXDP, etc. I checked power and configuration, all good, so I...dove in with XXDP. I have three 11/24 CPUs. Two of them drop to ODT when I run the JKDA diag, for the F11 MMU. Those two also report errors in every MS11-P board that I have (about eight) at the end of every 16KB "page" of memory during the ZMSP test. The third board passes all tests, and runs RSX11M's ACF without hanging. It's running sysgen now, and I expect the new executive to boot fine. Something is clearly up with those other two boards. -Dave -- Dave McGuire, AK4HZ New Kensington, PA