what are these errors in simh

Ron> Device DP23: does not interrupt - device disabled also for DP26, Ron> DP27 and DP30 ??? Most likely it means you have an incorrect I/O space layout. These are messages from the INIT part of RSTS/E. It assumes that I/O devices are installed according to the fixed and floating CSR layout rules. It uses that to identify the devices. Having identified each by its address, it then tries to verify that it works and what its vector is by "poking" it. (I don't know if MS ever claimed to have invented plug & play -- if they did, they are wrong...) So you have a device whose CSR address says it's DP11 unit number 23, and when spoken to as if it were a DP11, it doesn't wake up. Check the floating CSR rules and update your SIMH config... paul