On Tue, Jan 23, 2018 at 11:33 AM, Jack Harper via cctalk <<mailto:cctalk at classiccmp.org>cctalk at classiccmp.org> wrote: Greetings to the List from the Snowy Rocky Mountains. Beautiful clear sunny day here at +9F :) The SCSI controller on the 68K development system (VMEbus) that I have cobbled together occasionally hangs after I reset one of the processor boards (there are four MVME177-005 68060 boards in the VME rack). The hang then happens when my software touches the SCSI drives via the ROM'd 68K/Bug I/O primitives and the hang will not go away even after another reset until I cycle power. I have never before dealt with SCSI as a programmer - does this sound like something is configured incorrectly? There is not much to configure. I point out that I am not certain that I have the termination resistors correct. Thoughts? I appreciate any advice. Regards, Jack Evergreen Colorado Jack, Yes, two things that I'd be checking 1) Make sure all drives are assigned a different number 2) Make sure you have termination somewhere. Depending on the OS there are commands to display the scsi devices attached, as the OS sees them. Bill?