Boot process with boot manager in primary partition
When the boot manager Boot-US is installed in a primary partition
on the first hard disk, then initially the boot process is identical
to the standard boot process. Thus the BIOS loads the MBR which
searches for an active partition and loads the corresponding boot sector.
The active primary partition on the first hard disk is that partition in which
the boot manager of Boot-US was installed. The first sector
of this partition contains the first part (LOADR-US) of the boot manager.
The task of LOADR-US is --- similar to a boot sector --- to load the
main part (BMGR-US) of the boot manager and start it.
BMGR-US shows a menu with all configured partitions and waits for the
user to select a particular partition. Then BMGR-US loads the boot sector
of the selected partition from one of the local hard disks or from the
diskette and executes the code found on the boot sector. In this way the
selected partition is finally booted.
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