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simh.simh/VAX
Mark Pizzolato dd406478e4 MicroVAX I: Properly boot all VMS versions with differently located SYSBOOT
Different versions of VMS on different VAX systems default to different
locations for the secondary bootstrap program SYSBOOT.EXE.  Some
have it at [SYSEXE]SYSBOOT.EXE and others have it at
[SYS0.SYSEXE]SYSBOOT.EXE.

Digital sold different MicroVAX I and VAXStation I systems with different
boot ROMs that defaulted to look in one of these locations but not
consistently across systems that were sold.

This change uses the existing KA610 ROM image (that supports both
MicroVAX I and VAXStation I systems) and defaults to look for the
secondary bootstrap in [SYSEXE]SYSBOOT.EXE.  If the boot attempt
fails, on the currently connected disk, it retries looking for the
secondary bootstrap in [SYS0.SYSEXE]SYSBOOT.EXE.

This retry process does not work on the VAXStation I.  In order to boot
from disks which have SYSBOOT.EXE located in [SYS0.SYSEXE] you can
execute

    sim> BOOT /R5=100

and when you are prompted in the video screen with:

   Bootfile:

merely enter:

   Bootfile:[SYS0.SYSEXE]SYSBOOT.EXE
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