Dilog DQ614 Controller and RT11..

Once you are able to BOOT RT11FB on the DL0: device, you can issue the command: BOOT RT11XM and it should perform a so-called software boot - IF all the files are correct. You do NOT need to set up the boot block on DL0: to perform a software boot of RT11XM. Are you able to check that your files are correct on the DL0: device. The command: DIFF/BINARY DL0:*.* DU0:*.* will check all the same files with the same names on both devices. Other than DUX.SYS which is used by DU0:RT11XM.SYS when booted on the DU0: device and DLX.SYS which is used by DL0:RT11XMN.SYS, the rest of the files are all the same. And even DU0:RT11XM.SYS uses DU0:DLX.SYS to read and write files on the DL0: device. If all of the files are identical, then I find it VERY difficult to determine why DU0:DLX.SYS works when used from the DU0: device and does not work as DL0:DLX.SYS from the DL0: device. After all, it is the same software and hardware being used EXCEPT that the boot block from the file DL0:DLX.SYS is used only when you attempt to boot DL0:RT11XM.SYS on the DL0: device. If the boot block in the file DLX.SYS is corrupted, then that would prevent you from booting DL0:RT11XM.SYS on the DL0: device, but you would still be able to use DL0: as a data device from DU0: when you are running the DU0:RT11XM.SYS monitor. Please ask additional questions if I have not explained everything in a manner that you understand. Since you are able to boot RT11XM from DU0:, the MMU hardware seems OK. Jerome Fine