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Xenix - Unix I.P.B. 3117 28th January 1992 (PW)
Department Category Implementation
Xenix Software Advisory
Unix
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General Information

  1. Several people have reported problems with an inability to login single user and problems with the handling of "Carriage Return" on the console keyboard under SCO Unix. In the extreme case it has only been possible to take the machine multi-user. The problem is caused by the file /etc/ioctl.syscon which can safely be removed. Unix will then reconstruct this file as it boots restoring it to a sensible default.
  2. In the event of the Winchester boot tracks being lost (machine fails to even look for /boot and/or reports NO OS) they can be restored. The SCO N1 and N2 disks or emergency boot floppies can be used with the following commands. Type from a prompt:

    dd if=/etc/hdboot0 of=/dev/hd0a

    dd if=/etc/hdboot1 of=/dev/hd0a bs=1k seek=1

    If dparam is not present on the floppy disks then the Winchester should be mounted to use the copy present in the winchester /bin directory. Then issue the command:

    dparam -w

    which restores the master boot block which is at the beginning of the disk, immediately following the fdisk table of the disk. This block contains the disk parameter table which summarises the characteristics of the drive. Please note that the dparam line is required on most Apricot equipment but may not be applicable to other suppliers.

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Computing for a Connected World