@derringer3
The Kickstart ROM version of the IDE scsi.device only works
with the first 4GB of a harddisk. So when booting directly
from the OS4 partition fails but it works after inserting
the OS4 boot floppy which loads the OS4 version of the
IDE scsi.device which has no 4GB problem, my best guess is
that your OS4 boot partition is not located completely inside
the first 4GB of the IDE harddisk.